7:3=【5x+1】:

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7:3=【5x+1】:7:3=【5x+1】:7:3=【5x+1】:内项之积=外项之积3(5x+1)=7×615x+3=4215x=39x=15分之39x=5分之13

7:3=【5x+1】:
7:3=【5x+1】:

7:3=【5x+1】:
内项之积=外项之积
3(5x+1)=7×6
15x+3=42
15x=39
x=15分之39
x=5分之13

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