3x=2y+1;x=9y;求x,y的值?
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3x=2y+1;x=9y;求x,y的值?
3x=2y+1;x=9y;求x,y的值?
3x=2y+1;x=9y;求x,y的值?
把x=9y带入到3x=2y+1中得到
3*(9y)=2y+1
27y=2y+1
25y=1
y=1/25
x=9y=9/25
所以x=9/25,y=1/25
x=9y
3x=2y+1;
3*9y=2y+1
27y=2y+1
27y-2y=1
25y=1
y=1/25
x=9y=9*1/25=9/25
把x=9y代入3x=2y+1,得
27y=2y+1
27y-2y=1
25y=1
y=1/25
∴x=9×(1/25)=9/25
y=1/25
y=1/25;
x=9/25.
用代入法
将X=9Y代入
3*9y=2Y+1
27Y-2Y=1
Y=1/25
x=9/25
所以原方程的解为x=9/25,y=1/25
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