计算:1、(xy分之x²-y²)×(x-y分之x)-(y分之x);
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/10 10:10:33
计算:1、(xy分之x²-y²)×(x-y分之x)-(y分之x);
2、6xy²-9x²y-y³(解方程);
3、[(a²-4a+4分之a-1)-(a²-2a分之a+2)]÷(a分之4)-(1)
2、6xy²-9x²y-y³(解方程);
3、[(a²-4a+4分之a-1)-(a²-2a分之a+2)]÷(a分之4)-(1)
1、(xy分之x²-y²)×(x-y分之x)-(y分之x);
=(x+y)(x-y)/xy ×x/(x-y) -x/y
=(x+y)/y-x/y
=(x+y-x)/y
=1
2、6xy²-9x²y-y³(解方程);
=-y(9x²-6xy+y²)
=-y(3x-y)²
3、[(a²-4a+4分之a-1)-(a²-2a分之a+2)]÷(a分之4-1)
=[(a-1)/(a-2)² -(a+2)/a(a-2)]×a/(4-a)
=[a(a-1)-(a+2)(a-2)] /a(a-2)² ×a/(4 -a)
=(4-a)/a(a-2)² ×a/(4 -a)
=1/(a-2)²
=1/(a²-4a+4)
=(x+y)(x-y)/xy ×x/(x-y) -x/y
=(x+y)/y-x/y
=(x+y-x)/y
=1
2、6xy²-9x²y-y³(解方程);
=-y(9x²-6xy+y²)
=-y(3x-y)²
3、[(a²-4a+4分之a-1)-(a²-2a分之a+2)]÷(a分之4-1)
=[(a-1)/(a-2)² -(a+2)/a(a-2)]×a/(4-a)
=[a(a-1)-(a+2)(a-2)] /a(a-2)² ×a/(4 -a)
=(4-a)/a(a-2)² ×a/(4 -a)
=1/(a-2)²
=1/(a²-4a+4)
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