已知代数式1\2x a-1(次方)y3与-3x -b(次方)y 2a+b(次方)是同类项,则a=?b=?
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![已知代数式1\2x a-1(次方)y3与-3x -b(次方)y 2a+b(次方)是同类项,则a=?b=?](/uploads/image/z/1331479-55-9.jpg?t=%E5%B7%B2%E7%9F%A5%E4%BB%A3%E6%95%B0%E5%BC%8F1%5C2x+a-1%28%E6%AC%A1%E6%96%B9%29y3%E4%B8%8E-3x+-b%28%E6%AC%A1%E6%96%B9%29y+2a%2Bb%28%E6%AC%A1%E6%96%B9%29%E6%98%AF%E5%90%8C%E7%B1%BB%E9%A1%B9%2C%E5%88%99a%3D%3Fb%3D%3F)
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已知代数式1\2x a-1(次方)y3与-3x -b(次方)y 2a+b(次方)是同类项,则a=?b=?
已知代数式1\2x a-1(次方)y3与-3x -b(次方)y 2a+b(次方)是同类项,则a=?b=?
已知代数式1\2x a-1(次方)y3与-3x -b(次方)y 2a+b(次方)是同类项,则a=?b=?
是同类项则x和y次数相等
所以a-1=-b (1)
3=2a+b (2)
(1)+(2)
a-1+3=-b+2a+b
a=2
b=3-2a=-1
(1/2)x^(a-1)y^3与-3x^(-b)y(2a+b)是同类项
a-1=-b
2a+b=3
解方程组得
a=2
b=-1
a-1=-b 2a+b=3 a=2 b=-1