25×3.9+2.5简便运算,快!

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25×3.9+2.5简便运算,快!25×3.9+2.5简便运算,快!25×3.9+2.5简便运算,快!=25×3.9+25×0.1先采纳1001002.5*39+2.5=2.5*40=25*4-25*

25×3.9+2.5简便运算,快!
25×3.9+2.5简便运算,快!

25×3.9+2.5简便运算,快!
=25×3.9+25×0.1

先采纳

100

100

2.5*39+2.5=2.5*40

=25*4-25*0.1+2.5=50-2.5+2.5=50

100

100

=25x1一2,5x0,1

=25x(4-0.1)+2.5
=25x4-25x0.1+2.5
=100-2.5+2.5
=100