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你好同学,八点25×78简便计算的话,应该是直接计算,就是最简便的计算方式,八点25×78等于,643.5,所以最后的结果是643.5
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关于8.25×78的简便运算,操作如下:
8.25×78
=8.25×(70+8)
=8.25×70+8.25×8
=577.5+66
=643.5
8.25×78
=8.25×(70+8)
=8.25×70+8.25×8
=577.5+66
=643.5
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8.25x78的简便运算怎么算?
比较简单的方法是:
8.25×78
=(8+0.25)*(80-2)
=640+20-16-0.5
=640+3.5
=643.5
比较简单的方法是:
8.25×78
=(8+0.25)*(80-2)
=640+20-16-0.5
=640+3.5
=643.5
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2021-09-15
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解:
8.25x78
=8.25x(80-2)
=8.25x80-8.25x2
=(8+0.25)x80-17.5
=8x80+0.25x80-17.5
=640+0.25x4x20-17.5
=640+(0.25x4)x20-17.5
=640+1x20-17.5
=640+(20-17.5)
=640+2.5
=642.5
8.25x78
=8.25x(80-2)
=8.25x80-8.25x2
=(8+0.25)x80-17.5
=8x80+0.25x80-17.5
=640+0.25x4x20-17.5
=640+(0.25x4)x20-17.5
=640+1x20-17.5
=640+(20-17.5)
=640+2.5
=642.5
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8.25x78=8.25x(2x39)=(8.25x2)x(40-1)=16.5x40-16.5=660-16.5=643.5
8.25x78=8.25x(80-2)=8.25x80-8.25x2=660-16.5=643.5
8.25x78=8.25x(80-2)=8.25x80-8.25x2=660-16.5=643.5
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