用简便方法计算.47×21+79×47 449×101 134×25-25×33-25...
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发布时间:2024-10-24 01:11
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时间:2024-10-26 01:41
①47×21+79×47
=47×(21+79)
=47×100
=4700;
②449×101
=449×100+449×1
=44900+449
=45349;
③134×25-25×33-25
=(134-1-33)×25
=100×25
=2500;
④(125+40)×8
=125×8+40×8
=1000+320
=1320;
⑤132×99
=132×(100-1)
=132×100-132×1
=13200-132
=13068;
⑥125×88
=125×8×11
=1000×11
=11000.