102乘46 用简便算法托式计算
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102乘46 用简便算法托式计算
102x46
=(100+2)x(50-4)
=100x50+2x50-4x100-4x2
=5000-300-8
=4700-(10-2)
=4690+2
=4692
=(100+2)x(50-4)
=100x50+2x50-4x100-4x2
=5000-300-8
=4700-(10-2)
=4690+2
=4692