下面各題,能簡算的要用簡便方法計算

2021-05-29 16:03:10 字數 1960 閱讀 9708

1樓:孫叔

(1)2.9+6.46+7.1+3.54,=(2.9+7.1)+(6.46+3.54),=10+10,

=20;

(2)2.3÷8÷12.5,

=2.3÷(8×12.5),

=2.3÷100,

=0.023;

(3)0.4×(25+2.5),

=0.4×25+0.4×2.5,

=10+1,

=11;

(4)4.95×[2.46÷(5.58-5.28)],=4.95×[2.46÷0.3],

=4.95×8.2,

=40.59;

(5)9.16-1.25-3.

16-2.75,=9.16-3.

16-1.25-2.75,=(9.

16-3.16)-(1.25+2.

75),=6-4,=2.

下面各題,能簡算的要用簡便方法計算.2.9+0.46+7.1+0.5430÷2.5+1.6×2.50.4×(

2樓:餅餅

(1)2.9+0.46+7.1+0.54,=(2.9+7.1)+(0.46+0.56),=10+1,

=11;

(2)30÷2.5+1.6×2.5,

=12+4,

=16;

(3)0.4×(25+2.5),

=25×0.4+2.5×0.4,

=10+1,

=11;

(4)4.97×[2.46÷(5.58-5.28)],=4.97×[2.46÷0.3],

=4.97×8.2,

=40.754.

下面各題能簡算的要用簡便計算.1.36+4.85+2.64+6.15 98.5÷2.5÷4 5.4÷[2.5×(3.7-2.9)]0.8×(4-3.6

3樓:□小千

(1)1.36+4.85+2.64+6.15,=(1.36+2.64)+(4.85+6.15),=4+11,

=15;

(2)98.5÷2.5÷4,

=98.5÷(2.5×4),

=98.5÷10,

=9.85;

(3)5.4÷[2.5×(3.7-2.9)],=5.4÷[2.5×0.8],

=5.4÷2,

=2.7;

(4)0.8×(4-3.68)÷0.01,=0.8×0.32÷0.01,

=0.256÷0.01,

=25.6;

(5)83.7-12.83-0.17,

=83.7-(12.83+0.17),

=83.7-13,

=70.7;

(6)5.96+13×(3.2-3.12),=5.96+13×0.08,

=5.96+1.04,=7.

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

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