1.（x-1)^2+2(1-x)
=(x-1)(x-1-2)
=(x-1)(x-3)
2.(x-y)/(x+3y)÷(x^2-y^2)/(x^2+6xy+9y^2)-2y/(x+y）
=(x-y)/(x+3y)×(x^2+6xy+9y^2)/(x^2-y^2)-2y/(x+y）
=(x-y)/(x+3y)×(x+3y)^2/[(x-y)(x+y)]-2y/(x+y）
=(x+3y)/(x+y)-2y/(x+y）
=(x+3y-2y)/(x+y)
=1
计算：1.（x-1)^2+2(1-x) 2.(x-y)/(x+3y)÷(x^2-y^2)/(x^2+6xy+9y^2)-
2个回答
相关问题
-
计算(1)x×(9x^3y-3xy^2)÷（-3x^2y)(2)((x+y)^2-(x-y)^2)÷(-4xy)（3）三
-
(x+y)(x-y)+(x-y)^2-(6x^2×y÷2y-2xy^2÷2y)其中x=-3,y=1/3
-
（1）2x2x−1-x-1（2）（[x/x−y]-[2y/x−y]）•[xy/x−2y]÷（[1/x]+[1/y]）（3
-
计算(3x^3y-x^2y+1/2xy)÷(-1/2xy）
-
求值（x^2+xy)/(x^2-2xy-3y^2)*(3y-x)/(x-y)+(x^-1+y^-1)÷(x^-1-y^-
-
求值（x^2+xy)/(x^2-2xy-3y^2)*(3y-x)/(x-y)+(x^-1+y^-1)÷(x^-1-y^-
-
(1)计算:(-3xy)²·2x³÷(-6x² y); (2)化简：[(2x+y)
-
计算（1）(−2xy2)2÷(−14x2y2)•4xy（2）（3x-2y+1）（3x+2y-1）
-
(-6x^2y^3+2x^2y-1/2xy)÷(-1/2xy)
-
1.【x(x^2y^2-xy)-y(x^2-x^3y)]÷3x^2y