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四点3×2点4+2点5×5点七(脱式计算)

五点七减一点二六减三点零四脱式计算 五点七减一点二六减三点零四 =5.7-1.26-3.04 =5.7-(1.26+3.04) =5.7-4.3 =1.4

6.75×2.4+4.25×2.4-2.4 =(6.75+4.25-1)×2.4 =10×2.4 =24

2.5×4.4 =2.5×4×1.1 =10×1.1 =11

6.5×2.4-6.5+6.5×8.6 =6.5×(2.4-1+8.6) =6.5×10 =65

脱式计算七点5+2点五的和除以0.25乘四点二 (7.5+2.5)÷0.25*4.2 =10÷0.25*4.2 =40*4.2 =168

11.4+1.25×2.4 =11.4+1.25×8×0.3 =11.4+10×0.3 =11.4+3 =14.4

7.06×2.4-5.7 =16.944-5.7 =11.244

4.3×1.2×4 =4.3×4.8 =4.3×5-4.3×0.2 =21.5-0.86 =21.5-1+0.14 =20.64

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