0.25×3.1+2.5×0.65简便运算
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0.25×3.5+2.5×0.65
=0.25×3.5+0.25×6.5
=0.25×(3.5+6.5)
=0.25×10
=2.5
这样才好
不然0.25×(3.1+6.5)=0.25×9.6
=0.25×3.5+0.25×6.5
=0.25×(3.5+6.5)
=0.25×10
=2.5
这样才好
不然0.25×(3.1+6.5)=0.25×9.6
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原式=0.25*3.1+0.25*6.5
=0.25*(3.1+6.5)
=0.25*9.6
=0.25*4*2.4
=1*2.4
=2.4
=0.25*(3.1+6.5)
=0.25*9.6
=0.25*4*2.4
=1*2.4
=2.4
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0.25x3.1+0.25x6.5
=0.25x(3.1+6.5)
=0.25x9.6
=0.25x(10-0.4)
=2.5-0.1
=2.4
=0.25x(3.1+6.5)
=0.25x9.6
=0.25x(10-0.4)
=2.5-0.1
=2.4
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