0.25×1.8+2.5×0.22简便运算?
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0.25×1.8+2.5×0.22
=2.5×0.1×1.8+2.5×0.22
=2.5×0.18+2.5×0.22
=2.5×(0.18+0.22)
=2.5×0.4
=1
=2.5×0.1×1.8+2.5×0.22
=2.5×0.18+2.5×0.22
=2.5×(0.18+0.22)
=2.5×0.4
=1
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展开全部
0.25x1.8+2.5x0.22
=0.25x1.8+0.25x2.2
=0.25x(1.8+2.2)
=0.25x4
=1
先将2.5缩小10倍,0.22扩大10这样积保持不变,然后按乘法结合律提取相同数字,
=0.25x1.8+0.25x2.2
=0.25x(1.8+2.2)
=0.25x4
=1
先将2.5缩小10倍,0.22扩大10这样积保持不变,然后按乘法结合律提取相同数字,
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