18×18=22×22=29×72=18×43怎么做?
2个回答
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18×18
=(20-2)×(20-2)
=20×20-2×2×20+2×2
=400+4-80
=324
22×22
=(20+2)×(20+2)
=20×20+2×2×20+2×2
=400+80+4
=484
29×72
=30×72-1×72
=2160-72
=2160-100+28
=2088
18×43
=20×43-2×43
=860-86
=860-100+14
=774
=(20-2)×(20-2)
=20×20-2×2×20+2×2
=400+4-80
=324
22×22
=(20+2)×(20+2)
=20×20+2×2×20+2×2
=400+80+4
=484
29×72
=30×72-1×72
=2160-72
=2160-100+28
=2088
18×43
=20×43-2×43
=860-86
=860-100+14
=774
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2022-04-08
展开全部
22乘以括号18+8的简便算法:22×(18+8)22×26=(20+2)×26 =20×26+2×26 =520+52 =572
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