www.1862.net > 富民养殖场养鸡280只,养鸭只数比鸡多20%,养鹅只...

富民养殖场养鸡280只,养鸭只数比鸡多20%,养鹅只...

解:已知养殖场养鸡280只,养鸭只数比鸡多20%, 得鸭的只数=鸡的只数×(1+20%) =280×(1+0.2) =280×1.2 =336只 且养鹅只数比鸡鸭总数少25%, 得鹅的只数=(鸡的只数+鸭的只数)×(1-25%) =(280+336)×(1-0.25) =616×0.75 =462只 得养殖场...

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解:设鸡有x只,兔有100-x只, 2x+4×(100-x)=280 2x+400-4x=280 400-2x=280 2x=400-280 2x=120 x=120÷2 x=60 兔有:100-x=100-60=40只 答:鸡有60只,兔有40只。

解设兔子x只 4x+2(x+20)=280 6x+40=280 6x=240 x=40 鸡:40+20=60只

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