作业帮7.5×2.3+1.9×2.5+1.25×0.4怎么简便计算?
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7.5×2.3+1.9×2.5+1.25×0.4怎么简便计算?
7.5×2.3+1.9×2.5+1.25×0.4怎么简便计算?
7.5×2.3+1.9×2.5+1.25×0.4怎么简便计算?
7.5×2.3+1.9×2.5+1.25×0.4
=2.5×3×2.3+1.9×2.5+1.25×2×0.2
=2.5×6.9+1.9×2.5+2.5×0.2
=2.5×(6.9+1.9+0.2)
=2.5×9
=22.5
提2.5
2.5×3×2.3+2.5×1.9+2.5×0.5×0.4=2.5×(6.9+1.9+0.2)=2.5×9=22.5
化成=2.5*3*2.3+2.5*1.9+2.5*0.5*0.4
=2.5*（6.9+1.9+0.2）
=2.5*9
=2.5*10-2.5
=22.5
（10-2.5）x2.3+1.9x2.5+1.25x0.4=23-2.5x2.3+2.5x1.9+1.25x0.4=23-2.5x0.4+1.25x0.4=23-0.4x1.25
7.5×2.3+1.9×2.5+1.25×0.4怎么简便计算?
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