计算:(1) (2x-3y)+(5x+4y) (2) (8a-7b)-(4a-5b)
计算:(1) (2x-3y)+(5x+4y) (2) (8a-7b)-(4a-5b)
计算:(2a-5b)(2a^2-3ab+b^2) (3x+2y)(2x+3y)-(x-3y)(3x+4y)
1)已知4X=5y,求(X+y):y 2)已知(a-b):(a+b)=3:7,求a:b
1、A={(x,y)|y=x平方-4x=5},B={(x,y)|y=2x平方-7},求A交B
8x+2y+(5x-2y) X^2+(-3x^2-2y+1) 3a-(4b-2a+1)
初一几道计算忘了.x²-5x=2a(x-2y)-3b(2y-x)-4c(x-2y)=-5x²y
计算下列各题:3x+4x 9a+5a 4.2b+1.3b 2.5y+4y 8x+x 7n+n
计算:1、(2a-3b)(2a+3b)(-4a²-9b²) 2、(x-2y+3)(x+2y-3)
5a+2b+(3a-2b) -3x-(x+1)+(4x+2) -2/1(x+y)+3/1(x-y)
计算:1.【x-3y】乘【5a-2b】; 2.【-5x-1/3y】乘【3/5x-3/4y+2】;
求平方差公式计算 (a+3b)(a-3b) (1-5y)(1+5y) (3+2a)(-3+2a) (4x-5y)(4x+
1、计算(1)2/m+1/m (2)3b/xy-b/xy (3)(a/a+b)+b/a+b (4)(5x/2x-y)-x