7.2X4.6十4.6X12.71用简便方法?
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答案就是这样的
7.2×4.6+4.6×12.71=91.586
7.2×4.6+4.6×12.71=91.586
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7.2×4.6+4.6×12.71
=4.6×(7.2+12.71)
=4.6×19.91
=4.6×(20-0.09)
=4.6×20-4.6×0.09
=92-4.6×(0.1-0.01)
=92-0.46+0.046
=92-(0.46-0.046)
=92-0.414
=91.586
=4.6×(7.2+12.71)
=4.6×19.91
=4.6×(20-0.09)
=4.6×20-4.6×0.09
=92-4.6×(0.1-0.01)
=92-0.46+0.046
=92-(0.46-0.046)
=92-0.414
=91.586
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