脱式计算,能简算的要简算 240÷15÷4 129+318+71    304+278 25×(17×8) 700-300÷25

2020-05-15 社会 267阅读
(1)240÷15÷4,
=240÷(15×4),
=240÷60,
=4;

(2)129+318+71,
=(129+71)+318,
=200+318,
=518;

(3)304+278,
=(300+4)+(300-22),
=300+300-(22-4),
=600-18,
=582;

(4)25×(17×8),
=25×8×17,
=(25×4)×(2×17),
=100×34,
=3400;

(5)(614+346)÷48,
=960÷48,
=20;

(6)94×(205-188),
=94×17,
=1598;

(7)25×32×125,
=25×4×8×125,
=(25×4)×(8×125),
=100×1000,
=100000;

(8)420÷35,
=420÷(7×5),
=420÷7÷5,
=60÷5,
=12.

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