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四点3×2点4+2点5×5点七(脱式计算)

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

4.5×1.2+3.15÷15 =5.46+0.21 =5.67。

6.5÷1.3×2.4 =5×2.4 =12

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

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

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

3.2×2点5×1/11加11分之一脱式计算 3.2×2点5×1/11加11分之一脱 =11/11*2.5*4*0.8+1/11 =1/11*8+1/11 =1/11*(8+1) =1/11*9 =9/11

2.5×4.4 =2.5×4×1.1 =10×1.1 =11

7.06×2.4-5.7 =16.944-5.7 =11.244

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