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计算1.22²X900-1.33²X400

分类: 作业答案 • 2021-12-19 17:15:37
问题描述：

计算1.22²X900-1.33²X400

答

1.22²X900-1.33²X400
=1.22²X30²-1.33²X20²
=(1.22X30)² - (1.33X20)²
=36.6²-26.6²
=(36.6+26.6)(36.6-26.6)
=63.2x10
=632

答

1.22²X900-1.33²X400
=(1.22X30-1.33X20)(1.22X30+1.33X20)
=10X(1.22X3-1.33X2)X10X(1.22X3+1.33X2)
=100X(3.66-2.66)(3.66+2.66)
=100X1X(6.32)
=632

答

1.22²X900-1.33²X400
=(1.22*30)²-(1.33*20)²
=36.6²-26.6²
=(36.6-26.6)(36.6+26.6)
=10*63.2
=632

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