0.72×1.2×1点二五×2点五怎么用简便运算

2024-11-08 04:32:26
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网友(1):

0.72×1.2×1.25×2.5
=(0.8×0.9)×(1+0.2)×1.25×2.5
=0.8×1.25×0.9×[(1+0.2)×2.5]
=1×0.9×(1×2.5+0.2×2.5)
=0.9×(2.5+0.5)
=0.9×3
=2.7