(450-x)÷1/2=(300-x)÷(1-4/5)
1个回答
(450-x)*2=(300-x)*4
450-x=(300-x)*2
450-x=600-2x
x=150
相关问题
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x÷4.5—x÷(4.5—1.5)=2.5怎么解