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解方程:4X-12=36,3X-4×5=39,(5X-15)×8=72...

22-5x=12 5x=22-12=10 x=10÷5=2 12+4x=72 4x=72-12=60 x=60÷4=15

0.8X72.4X12.5 =(0.8X12.5)X72.4 =10X72.4 =724

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