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脱式计算 能够简算的一定要简算. 38÷[(15+14)×38]4-45÷4-45914+9
问题详情
脱式计算,能够简算的一定要简算.
参考答案
①38÷[(15+14)×38],
=38÷38÷(15+14),
=1÷920,
=1×209,
=229;
②4-45÷4-45,
=4-45×14-45,
=4-(15+45),
=4-1,
=3;
③914+9.8+9.25×15,
=9.25×(9.8+0.2),
=9.25×10,
=92.5;
④25×(4×11)×7,
=(25×4)×(11×7),
=100×77,
=7700;
⑤(112+35)÷160,
=(112+35)×60,
=60×112+35×60,
=5+36,
=41;
⑥101×120-83-37,
=101×120-(83+37),
=120×(101-1),
=120×100,
=12000.
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