簡算.(1)1.25×32×2.5(2)7.25-337+3.75-647(3)0.625×12.2-58×3.2+58.

簡算.(1)1.25×32×2.5(2)7.25-337+3.75-647(3)0.625×12.2-58×3.2+58.


(1)1.25×32×2.5,=1.25×8×4×2.5,=(1.25×8)×(4×2.5),=10×10,=100;(2)7.25-337+3.75-647,=(7.25+3.75)-(647+337),=11-10,=1;(3)0.625×12.2-58×3.2+58,=0.625×12.2-0.625×3.2+0.62…



8×75%-3÷3/4 8.5×0.75+7.5×75% 5/8-5/6×(1/4-25%)能簡算要簡算
8×75%-3÷3/4 8.5×0.75+7.5×75% 5/8-5/6×(1/4-25%)能簡算要簡算


8×75%-3÷3/4
=8×3/4-4
=6-4
=2
8.5×0.75+7.5×75%
=8.5×0.75+7.5×0.75
=0.75×(8.5+7.5)
=3/4×16
=12
5/8-5/6×(1/4-25%)
=5/8-5/6×(1/4-1/4)
=5/8-5/6×0
=5/8-0
=5/8
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