1樓:小拿說動漫
五年級下冊數學題,分數簡便計算,你知道答案嗎?
2樓:匿名使用者
止65885+35456794
3樓:匿名使用者
x/2+x/3+x/4=65
(6x+4x+3x)/12=65
13x/12=65
x=65x12/13=60
4樓:匿名使用者
56.8+43.2=100
5樓:樂觀的冰萱
5.4除於1.8加240乘1.5
等於3加240乘1.5
等於3加360
等於363
6樓:高材生
一、口算下面各題
10-2.65= 0.9×0.08= 528-349= 6+14.4= 24÷0.04=
12.34-2.3= 0÷3.8= 0.77+0.33= 7÷1.4= 67.5+0.25=7.2÷8×4= 5-1.4-1.6=
00÷125÷8= 1.9×4×0.5=
80×0.125= 3× = 6 6= 2 -( + )= 10 2=
3.2×7÷3.2×7= ( - )×12= 187.7×11-187.7= 1- 62.5%=
二、寫出下列每題在簡便運算時所運用的定律或性質
4 +3.2+5 +6.8 25×(8×0.4)×1.25 7 -(2 - )
( + + )×72 93.5÷3 16÷2.5
720÷16÷5 630÷42 456-(256-36)
102×35 98×42 158+262+138 375+219+381+225
5001-247-1021-232 (181+2564)+2719 378+44+114+242+222
276+228+353+219 (375+1034)+(966+125) (2130+783+270)+1017
99+999+9999+99999 7755-(2187+755) 2214+638+286
3065-738-1065 899+344 2357-183-317-357
2365-1086-214 497-299 2370+1995
7樓:在古運河仰望星空的啟明星
)(0.5+x)+x=9.8÷2
(2)2(x+x+0.5)=9.8
(3)25000+x=6x
(4)3200=440+5x+x
(5)x-0.8x=6
(6)12x-8x=4.8
(7) 7.5+2x=15
(8)1.2x=81.6
(7)x+5.6=9.4
(10)x-0.7x=3.6
(11)91÷x=1.3
(12) x+8.3=10.7
(13) 15x=3
(14) 3x-8=16
(15) 3x+9=27
(16) 18(x-2)=270
(17) 12x=300-4x
(18) 7x+5.3=7.4
(19) 3x÷5=4.8
(25) 0.5x+8=43
(26) 6x-3x=18
(27) 7(6.5+x)=87.5
(28) 0.273÷x=0.35
(29) 1.8x=0.972
(30) x÷0.756=90
(31) 0.1(x+6)=3.3×0.4(32) (27.5-3.5)÷x=4
(33) 9x-40=5
(34) x÷5+9=21
(35) 48-27+5x=31
(36) 10.5+x+21=56
(37) x+2x+18=78
(38) (200-x)÷5=30
(39) (x-140)÷70=4
(40) 20-9x=2
(41) x+19.8=25.8
(42) 5.6x=33.6
(43) 9.8-x=3.8
(44) 75.6÷x=12.6
(45) 5x+12.5=32.3
(46) 5(x+8)=102
(47) x+3x+10=70
(48) 3(x+3)=50-x+3
(49) 5x+15=60
(50) 3.5-5x=2
(51) 0.3×7+4x=12.5
(52) x÷1.5-1.25=0.75
(53) 4x-1.3×6=2.6
(54) 6x+12.8=15.8
(55) 150×2+3x=690
(56) 2x-20=4
(57) 3x+6=18
(58) 2(2.8+x)=10.4
(59) (x-3)÷2=7.5
(60) 13.2x+9x=33.3
(61) 3x=x+100
(62) x+4.8=7.2
(63) 6x+18=48
(64)3(x+2.1)=10.5
(65)12x-9x=8.7
(66)13(x+5)=169
(67) 2x-97=34.2
(68)3.4x-48=26.8
(69)42x+25x=134
(70)1.5(x+1.6)=3.6
(71)2(x-3)=5.8
(72)65x+7=137
(73) 9x+4×2.5=91
(74) 4.2 x+2.5x=134
(75) 10.5x+6.5x=51
(76) 89x-43x=9.2
(77) 5x-45=100
(78) 1.2x-0.5x=6.3
(79) 23.4=2x
(80) 4x-x=48.6
(81) 4.5x-x=28
(82)x-5.7=2.15
(83)5x-2x=18
(84)3x+0.7=7
(85) 3.5×2= 4.2+x
(86) 26×1.5= 2x+10
(87) 0.5×16―16×0.2=4x(88) 13 9.25-x=0.403
(89) 18.9÷x=0. 3
(90) 23x=14x+27
(91) x+14x=75
(92)95-5x=80
(93)1.8 +6x=54
(94) 6.7x-60.3=6.7
(95) 9+4x=53
(96) 2x+8=16
(97) 20x-14x=24
五年級下冊數學簡便演算法帶答案
8樓:瀛洲煙雨
例1、5.76+
13.67+4.24+6.33
=(5.76+4.24)+(13.67+6.33)=10+10
=20例2、37.24+23.79-17.24
=37.24-17.24+23.79
=20+23.79
=43.79
例3、 4×3.78×0.25
=4×0.25×3.78
=1×3.78
=3.78
例4、 125×246×0.8
=125×0.8×246
=100×246
=24600
例5、(2.5+12.5)×40
=2.5×40+12.5×40
=100+500
=600
例6、3.68×4.79+6.32×4.79=(3.68+6.32)×4.79
=10×4.79
=47.9
例7. 26.86×25.66-16.86×25.66=(26.86-16.86) ×25.66=10×25.66
=256.6
例8、 5.7×99+5.7
= 5.7×(99+1)
=5.7×100
=570
例9、34×9.9
=34×(10-0.1)
=34×10-34×0.1
=340-3.4
=336.6
例10、 57×101
=57×(100+1)
=57×100+57×1
=5757
例11、7.8×1.1
=7.8×(1+0.1)
=7.8×1+7.8×0.1
=7.8+0.78
=8.58
例12、25×32
=25×4×8
=100×8
=800
例13、125×0.72
=125×8×0.09
=1000×0.09
=90例14、87×2/85
=(85+2) ×2/85
=85×2/85+2×2/85
=2+4/85
=2又4/85
例15、56.5-3.7-6.3
=56.5-(3.7+6.3)
=56.5-10
=46.5
例16、32.6÷0.4÷2.5
=32.6÷(0.4×2.5)
=32.6÷1
=32.6
例16、86.7×0.356+1.33×3.56=8.67×3.56+1.33×3.56
=(8.67+1.33)×3.56
=10×3.56
=35.6
例17、15.6÷4-5.6×1/4
=15.6×1/4-5.6×1/4
=(15.6-5.6)×1/4
=10×1/4
=2又1/2
例18、16/23×27+16×19/23=27/23×16+16×19/23
=16×(27/23+19/23)
=16×2=32
9樓:巨集哥
0.25×1.25×32
=(0.25×4)×(1.25×8)
=1×10=10
10樓:歐璟衛思山
簡便計算題:
1)6.9+4.8+3.1
0.456+6.22+3.78
2)4.02+5.4+0.98
5.17-1.8-3.2
13.75-(3.75—6.48)
3)3.68+7.56-2.68
7.85+2.34-0.85+4.66
35.6-1.8-15.6-7.2
4)3.82+2.9+0.18+9.1
9.6+4.8-3.6
7.14-0.53-2.47
5)5.27+2.86-0.66+1.6313.35-4.68+2.65
6)47.8-7.45+8.8
0.398+0.36+3.64
15.75+3.59-0.59+14.257)66.86-8.66-1.34
0.25×16.2×4
(1.25-0.125)×8
8)3.6×102
3.72×3.5+6.28×3.5
36.8-3.9-6.1
9)28.6×101-28.6
4.8×7.8+78×0.52
32+4.9-0.9
10)4.8×100.1
56.5×9.9+56.5
7.09×10.8-0.8×7.09
11)25.48-(9.4-0.52)
4.2÷3.5
320÷1.25÷8
12)18.76×9.9+18.76
3.52÷2.5÷0.4
3.9-4.1+6.1-5.9
13)5.6÷3.5
9.6÷0.8÷0.4
4.2×99+4.2
14)17.8÷(1.78×4)
0.49÷1.4
1.25×2.5×32
15)15.2÷0.25÷4
146.5-(23+46.5)
16)3.83×4.56+3.83×5.444.36×12.5×8
9.7×99+9.7
17)27.5×3.7-7.5×3.7
8.54÷2.5÷0.4
0.65×101
18)(45.9-32.7)÷8÷0.1253.14×0.68+31.4×0.032
5.6÷1.25÷0.8÷2.5÷0.4
19)7.2×0.2+2.4×1.4
7.74×(2.8-1.3)+1.5×2.2620)3.9×2.7+3.9×7.3
18-1.8÷0.125÷0.8
12.7×9.9+1.27
21)21×(9.3-3.7)-5.6
15.02-6.8-1.02
5.4×11-5.4
22)2.3×16+2.3×23+2.3
9.43-(6.28-1.57)
3.65×4.7-36.5×0.37
23)46×57+23×86
13.7×0.25-3.7÷4
2.22×9.9+6.66×6.7
24)101×0.87-0.91×87
10.7×16.1-15.1×10.7
0.79×199
25)4.8+8.63+5.2+0.37
5.93+0.19+2.81
1.76+0.195+3.24
26)2.35+1.713+0.287+7.651.57+0.245+7.43
6.02+3.6+1.98
27)0.134+2.66+0.866
1.27+3.9+0.73+16.1
7.5+4.9-6.5
28)3.07-0.38-1.62
1.29+3.7+2.71+6.3
8-2.45-1.55
29)3.25+1.79-0.59+1.7523.4-0.8-13.4-7.2
0.32×403
30)3.2+0.36+4.8+1.64
1.23+3.4-0.23+6.6
0.25×36
31)12.7-(3.7+0.84)
36.54-1.76-4.54
0.25×0.73×4
32)7.6×0.8+0.2×7.6
0.85×199
0.25×8.5×4
33)1.28×8.6+0.72×8.6
12.5×0.96×0.8
10.4-9.6×0.35
34)0.8×(4.3×1.25)
3.12+3.12×99
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