(2600-x)*1/4+1/5x=600急
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(2600-x)*1/4+1/5x=600急(2600-x)*1/4+1/5x=600急(2600-x)*1/4+1/5x=600急原方程两边同乘以20,可得:5*(2600-x)+4x=20*600
(2600-x)*1/4+1/5x=600急
(2600-x)*1/4+1/5x=600
急
(2600-x)*1/4+1/5x=600急
原方程两边同乘以20,可得:
5*(2600-x)+4x=20*600
5*2600-5x+4x=5*2400
-x=5*2400-5*2600
解得:x=5*200=1000
(2600-x)×(1/4)+(1/5)x=600
650-(1/4)x+(1/5)x=600
(1/20)x=50
x=1000
3/x-1=4/x 6/x+1=x+5/x(x+1)
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