1樓:生活助手小薛
75+360÷(20-5) 簡單計算吐:=75+360÷(20-5)=75+360÷15=75+360÷3÷5=75+120÷5=75+24=99擴充套件data 簡單計算方法: 1.
補舍入法 對於接近整數
十、一百……的數字,將其轉換為
十、一百……,加減一個數,即可進行計算簡單的。例如:536-198=536_(200_2)=536_200+2=33844x101=44x(100+1)=44x100+44=44442,分解法。
在一些乘法和除法運算中,可以將其中一個數分解,以使計算更容易。例如:25x1.
25x32=25x1.25x(4x8)=(25x4)x(1.25x8)=100x10=1000560÷35=560÷7÷5=80÷5=163,部分基準數接近a某數相加,可以用某一個數作為參考數,然後將參考數乘以相加的數,再將每個數與參考數的差相加即可得到計算結果。
例如:81+85+82+78+79=80x5+(1+5+2-2-1)=400+5=405
2樓:匿名使用者
四年級下冊數學簡便計算題
92+99 197+102 354-108
=92+(100-1) =197+(100+2) =354-(100+8)
=92+100-1 =197+100+2 =354-100-8
=191 =299 =246
405-99 127-98 323+189-123
=405-(100-1) =127-(100-2) =323-123+189
= 405-100+1 =127-100+2 =389
=306 =29
545-167-145 478-47-178 344-(144+37)
=545-145-167 =478-178-47 =344-144-37
=233 =253 =163
236-(177+36) 400-256-44 517-53-47
=236-36-177 =400-(256+44) =517-(53+47)
=23 =100 =417
248+86-48 672-36+64 (6467-832)+(1832-1467)
=248-48+86 =672-(36+64) =6467-1467+(1832-832)
= 286 =572 =6000
1530+(592-530)-192 (2+4+6+……+98+100)-(1+3+5+……+97+99)
=1530-530+(592-192) =(2-1)+(4-3)+…+(98-97)+(100-99)
=1400 =1+1+...+1+1 =50
25×9×4 45×4×5 23 ×5×2
=25×4×9 =45×(4×5) =23×(5×2)
=900 =90 =230
8×(125×13) (250×125)×(4×8)
=8×125×13 =125×8×(250×4)
=13000 =1000000
42×125×8×5 25×4×88×125
=125×8×(42×5) =100×11×(8×125)
=210000 =1100000
72×125 125×64×25 42×125×8×5
=8×125×9 =125×8×(25×8) =42×5×(125×8)
=9000 =200000 = 210000
25×4×88×125 88×125
=100×(8×125) ×11 =8×125×11
=100×1000×11 =1000×11
=100000×11 =11000
=1100000
(12+50)×40 125×(40-4) 76×103
=12×40+50×40 =125×40-125×4 =76×(100+3)
=880 =5400 =76×100+76×3
=880 =5400 =76×100+76×3
=7828
18×125 25×44 42×25
=(10+8)×125 =25×4×11 =2×25×21
=10×125+8×125=2250 =110 =1050
99×78 99×9
=(100-1) ×78 =(100-1)×9
=100×78-1×78 =100×9-9×1
=7800-78 =900-9
=7722 =891
45×37+37×55 28×21+28×79 17×23-23×7
=37×+(45+55) =28×(21+79) =23×(17-7)
=3700 =2800 =230
38×46+64×38 99×32+32 46+46×59
=38×(46+64) =32×(99+1) = 46×(59+1)
=38×110 =3200 =2760
=38×(100+10)
=38×100+38×10
=4180
167×2+167×3+167×5 39×8+6×39-39×4
=167×(2+3+5) =39×(8+6-4)
=1670 =390
28×225-2×225-6×225 (42+25)×125+(18+15)×125
=225×(28-2-6) =125×(42+18+25+15)
=4500 =12500
23×2×4+25×4×2+27×1×8+25×8×1 99×22+33×34
=8×(23+25+27) =33×(66+34)
=600 =3300
(12+50)×40 125×(40-4) 86×103
=12×40+50×40 =125×40-125×4 =86×(100+3)
=680 =4500 =86×100+86×3
=8858
18×125 25×44 42×25
=(10+8) ×125 =25×4×11 =2×25×21
=125×10+125×8 =1100 =1050
=2250
99×9 99×78 45×38+38×55
=(100-1) ×9 =(100-1) ×78 =(45+55) ×38
=100×9-9 =78×100-78 =3800
=91 =7722
28×21+28×79 37×23-23×7 38×46+64×38
=(21+79) ×79 =(37-7) ×23 =(46+64) ×38
=7900 =690 =3800
99×32+32 46+46×59 167×2+167×3+167×5
=(99+1) ×32 =(59+1) ×59 =(2+3+5) ×167
=3200 =3540 =1670
39×8+6×39-39×4 28×225-2×225-6×225
=(8+6-4) ×39 =(28-2-6) ×225
=390 =2500
(42+25)×125+(18+15)×125 2005×20062006-2006×20052005
=[(42+18)+(25+15)] ×125 =2005×2006×10001-2006×2005×10001
=12500 =0
360÷4÷9 250÷5÷2 600÷12÷5
=360÷(4×9) = 250÷(5×2) =600÷(12×5)
=10 =25 =10
800÷5÷8 480÷5÷48 240÷5÷12
=800÷8÷5 =480÷48÷5 =240÷12÷5
=20 =2 =4
420÷35 2400÷25 7800÷12
=420÷7÷5 =2400÷5÷5 =7800÷6÷2
=12 =96 =650
960×46÷48 99000÷121×11 3702×38÷1234
=960÷48×46 =99000÷(121÷11) =1234×3×38÷1234
=920 =9000 =114
640÷(16÷4) 1000÷(125÷4)
=640÷16×4 =1000÷125×4
=160 =32
250÷5÷2 600÷12÷5 800÷5÷8 480÷5÷48
=250÷(5×2) =600÷(12×5) =800÷8÷5 =480÷48÷5
=25 =10 =20 = 2
240÷5÷12 420÷35 117+392+608 88×27+27×12
=240÷12÷5 =420÷7÷5 =117+(392+608) =(88+12) ×27
=4 =12 =1117 =270
45×4×5 23 ×5×2
=45×(4×5) =23×(5×2)
=90 =230
25×9×4 8×(125×13) (250×125)×(4×8)
=25×4×9 =8×125×13 =250×4×(125×8)
=900 =13000 =1000000
88×125 72×125 125×64×25
=11×(8×125) =9×(8×125) =125×8×(8×25)
=11000 =9000 =100000
42×125×8×5 25×4×88×125 (12+50)×40
=42×5×(8×125) =100×11×(8×125) =12×40+50×40
=210000 =1100000 =2480
125×(40-4) 76×103 18×125
=125×40-125×4 =76×(100+3) =(10+8) ×125
=4500 =76×100+3×76 =10×125+8×125
=7828 =2250
25×44 42×25 99×9 99×78
=25×(40+4) =(40+2) ×25 =(100-1) ×9 =(100-1) ×78
=25×40+25×4 =40×25+2×25 =9×100-9 =7800-78
=1100 =1050 =891 =7722
45×37+37×55 28×21+28×79 17×23-23×7
=(45+55) ×37 =(21+79) ×79 =(17-7) ×23
=3700 =7900 =230
38×46+64×38 99×32+32 46+46×59
=(46+64) ×38 =(99+1) ×32 =(59+1) ×46
=110×38 =3200 =2760
=(10+100) ×38
=38×10+38×100
=4180
167×2+167×3+167×5 39×8+6×39-39×4 360÷4÷9
=(2+3+5) ×167 =(8+6-4) ×39 =360÷(4×9)
=1670 =390 =10
117+392+608 88×27+27×12
=117+(392+608) =(88+12) ×27
=1117 =2700
88×27+27×12 125×64+125×36
=(88+12) ×27 =(64+36) ×125
=2700 =12500
64×199+64
=64×(199+1)
=12800
87×53+87×47 7×75-7×25 167×25+32×25+25
=(53+47) ×87 =(75-25) ×7 =(167+32+1) ×25
=8700 =350 =5000
38×99+38 147+147×99 25×(4+8)
=(99+1) ×38 =(99+1) ×147 =25×4+8×25
=3800 =14700 =300
108×75 35×201 75×98
=(100+8) ×75 =35×(200+1) =75×(100-2)
=8100 =7035 =7350
25×7×4 2×125×8×6 25×32×125
=25×4×7 =2×6×(125×8) =25×4×(8×125)
=700 =12000 =100000
125×88 25×48 3500÷4÷25
=25×8×11 =25×8×6 =3500÷(4×25)
=11000 =600 =35
420÷35÷2 2.1 × 99 + 2.1
=420÷(35×2) =2.1×(99+1)
=60 =210
4800÷25 (13×8×5×6)÷(4×5×6)
=48×100÷25 =13×(8÷4) ×(5÷5) ×(6÷6)
=48×4 =26
=192
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