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数学
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用简便方法计算:1)50又3分之1×49又3分之2 2)102²
人气:452 ℃ 时间:2020-01-28 03:09:32
解答
50又3分之1×49又3分之2
=(50+1/3)×(50-1/3)
=50×50-1/3×1/3
=2500-1/9
=2499又8/9
102²
=(100+2)的平方
=100×10+2×100×2+2×2
=10000+400+4
=10404
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