1樓:_戀莫
①2.2×3.83+11
5×5.17+115
=115
×3.83+11
5×5.17+115,
=(3.83+5.17+1)×115,
=10×115,
=22;
②2.5×2.4+1.84+5.16
=6+(1.84+5.16),
=6+7,
=13;
③7.8÷[32×(1-5
8)+3.6]
=7.8÷[32×3
8+3.6],
=7.8÷[12+3.6],
=7.8÷15.6,
=0.5;④45
×23+15
÷34=815+15
×43,=8
15+415,
=45;⑤3.8-(2.8+0.57)
=3.8-2.8-0.57,
=1-0.57,
=0.43;⑥89
×[34
?(716?14
)]=8
9×[34+1
4-716],=89
×[1-7
16],=89
×916,=12.
計算下列各題,要寫出主要計算過程,能用簡便方法的要用簡便方法計算. ①16×18-120÷15 ②3.2×2.
2樓:手機使用者
①16×18-120÷15,
=288-8,
=280;
②3.2×2.77+0.23×3.2,
=3.2×(62616964757a686964616fe59b9ee7ad94313333353365362.77+0.23),
=3.2×3,
=9.6;
③7.6-2.05÷0.82,
=7.6-2.5,
=5.1;
④7 8
-517
+9 8
-1217
,=(7 8
+9 8
)-(5
17+12
17),
=2-1,
=1;⑤2 9
-716
×2 9
,=2 9
×(1-7
16),
=2 9
×916
,=1 8
;⑥13÷(1 4
+5 6
)×3 4
,=13÷13
12×3 4
,=12×3 4
,=9.
計算下面各題,能用簡便方法的要用簡便方法計算. (1)9.78×2.3+2.3×10.22 (2)1.5×11-7.8
3樓:小希
(1)9.78×
2.3+2.3×10.22,
=(9.78+10.22)×2.3,
=20×2.3,
=46;
(2)1.5×11-7.83+3.5,
=16.5-7.83+3.5,
=8.67+3.5,
=12.17;
(3)7.25÷(31-29.55)×1.3,=7.25÷1.45×1.3,
=5×1.3,
=6.5;
(4)75.6÷[0.7×(8.5-7.6)],=75.6÷[0.7×0.9],
=75.6÷0.63,
=120.
計算下面各題.(能簡便的要用簡便方法計算)2.3+3.91÷(22-19.7)21.6÷[64.8-(48.6-2.7×2)]0.25×0
4樓:手機使用者
(1)2.3+3.91÷(22-19.7)=2.3+3.91÷2.3
=2.3+1.7
=4(2)21.6÷[64.8-(48.
6-2.7×2)]=21.6÷[64.
8-(48.6-5.4)]=21.
6÷[64.8-43.2]
=21.6÷21.6
=1(3)0.25×0.03×4
=(0.25×4)×0.03
=1×0.03
=0.03
0.13×3.89+0.13×5.11
=0.13×(3.89+5.11)
=0.13×9
=1.17
(5)10.1×87
=(10+0.1)×87
=10×87+0.1×87
=870+8.7
=878.7
下面各題,能用簡便方法計算的用簡便方法計算:2.5×12.5×32 6.4÷2.5÷0.4 5.4×0.36+0.64×5.4 9
5樓:古玉紅
(1)2.5×12.5×32
=(2.5×4)×(12.5×8),
=10×100,
=1000;
(2)6.4÷2.5÷0.4
=6.4÷(2.5×0.4),
=6.4÷1,
=6.4;
(3)5.4×0.36+0.64×5.4
=5.4×(0.36+0.64),
=5.4×1,
=5.4;
(4)9÷0.75+9÷0.25
=12+36,
=48;
(5)17.2-0.71-0.29
=17.2-(0.71+0.29),
=17.2-1,
=16.2;
(6)8.6+1.4÷2.5
=8.6+0.56,
=9.16.
下面各題,能簡算的要用簡便方法計算.2.9+0.46+7.1+0.54 ...
6樓:二邁镸
①2.9+0.46+7.1+0.54
=(du2.9+7.1)+(0.46+0.54)=10+1
=11;zhi
②(31.6-11.7)÷2.5÷0.4
=19.9÷(2.5×
dao0.4)
=19.9÷1
=19.9;
③0.4×37×25
=37×(0.4×25)
=37×10
=370;
④內4.97÷1.25+3.03×8
=4.97÷10
8+3.03×8
=0.497×8+3.03×8
=(0.497+3.03)×容8
=3.527×8
=28.216.
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