x/3.6=5/9

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x/3.6=5/9
x/3.6=5/9

x/3.6=5/9
x/3.6=5/9
x=5/9*3.6
x=2

x/3.6=5/9
x=5/9*3.6=5/9*18/5=2

收起
x/3.6=5/9
x=3.6×5/9
x=0.4×5
x=2