问题 解答题
计算,能用简便方法计算的要写出简算的主要过程.
5.24+7.9+4.76
25×37×4
5.12-1.47-2.5356×125
96.2+78-6.2450÷5÷9
52×23+48×23510-240÷12×15
156×101-156(2400-80×20)÷20
4.5+3.15-4.5+3.15.
答案

(1)5.24+7.9+4.76

=5.24+4.76+7.9

=10+7.9

=17.9;

(2)25×37×4

=25×4×37

=100×37

=3700;

(3)5.12-1.47-2.53

=5.12-(1.47+2.53)

=5.12-4

=1.12;

(4)56×125

=7×(8×125)

=7×1000

=7000;

(5)96.2+78-6.2

=96.2-6.2+78

=90+78

=168;

(6)450÷5÷9

=450÷(5×9)

=450÷45

=10;

(7)52×23+48×23

=(52+48)×23

=100×23

=2300;

(8)510-240÷12×15

=510-20×15

=510-300

=210;

(9)156×101-156

=156×(101-1)

=156×100

=15600;

(10)(2400-80×20)÷20

=(2400-1600)÷20

=800÷20

=40;

(11)4.5+3.15-4.5+3.15

=4.5-4.5+(3.15+3.15)

=0+6.3

=6.3.

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