(5x-7):(3y+2)=1:2 (y)(5x-7):(3y+2)=1:2(y-3):(4x-1)=1:3求x的平方减y的平方等于多少?
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(5x-7):(3y+2)=1:2(y)(5x-7):(3y+2)=1:2(y-3):(4x-1)=1:3求x的平方减y的平方等于多少?(5x-7):(3y+2)=1:2(y)(5x-7):(3y+2
(5x-7):(3y+2)=1:2 (y)(5x-7):(3y+2)=1:2(y-3):(4x-1)=1:3求x的平方减y的平方等于多少?
(5x-7):(3y+2)=1:2 (y)
(5x-7):(3y+2)=1:2
(y-3):(4x-1)=1:3
求x的平方减y的平方等于多少?
(5x-7):(3y+2)=1:2 (y)(5x-7):(3y+2)=1:2(y-3):(4x-1)=1:3求x的平方减y的平方等于多少?
(5x-7):(3y+2)=1:2
(y-3):(4x-1)=1:3
组成方程组
2(5x-7)=3y+2
3(y-3)=4x-2
解方程组
10x-3y=16
3y-4x=8
两式相加
6x=24
x=4
y=3
x的平方-y的平方=7
-(5x+y)-7(x-y) -2分之1(x+y)+4分之1(x+2y) 4x-2(x-2) -2x-(3x-1) x-(5x-2y)+2(2x-y)
(2) 5分之x+2分之y=6分之5,x+y=3 6x-7y=--2.5x-2y=-0.9三元一次方程组(1)x+y+z=1,x-y+z=3,x+y-z=-1 (1)x-y=3,x+2y+z=8,2x-y-3z=1 (3) 3(2x-y)+4(x-2y)=87,2(3x-y)-3(x-y)=82麻烦再接解道题3(2x-y)+4(x-2y)=87,2(3x-y)-3(x-y)=82解三元一
10/x+y+3/x-y=-5 15/x+y-2/x-y=-1(用换元法解此方程组)
方程组:第一题(5+1)x=5y 第二题x-y/3=x+y/2 4y-4x=30+10 2x-3y=7(5+1)x=5y x-y/3=x+y/2 4y-4x=30+10 2x-5y=7 上面那个题目错的
若(5x+y)/(7x+10y)=1/2则x/y=
把下列各式分解因式 x(x+y)(x-y)-x(y+x)² 2 已知2x+y=6,x-3y=1,求7y(x-3y)²把下列各式分解因式x(x+y)(x-y)-x(y+x)²7、已知2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
请解答方程组:(39)2x+y=5 (40)x+y=7 (41)2x+3y=12 (42)2x+y=3ax+3y=7 2x-y=8 3x+4y=17 3x-5y=11(43)3x+y=82 (44)3(x-1)=y+5 45 x/4+y/3=7 (46)x+y/3 +x-y/2=610x-11y=87 5(y-1)=3(x+5) 2/3x+y/2=14 3(x+y-)2(x-y)=28
分式的加减:[(x/y-y/x)除以(x+y)+x(1/y-1/x)]除以1+x/y,其中x=5,y=2
化简 求值 x-{-5x-[-y+(-x+3y)+x]},其中x=-1,y=-2;
2元一次方程组的答案(1)2x+3y=40 (2)5x+2y=18 (3)7x+2y=11 y=2x y=-x x-y=-1
帮我做2道数学方程(1)6x-7y-40=0 5y-2x+8=0(2)(x+y)/2+(x-y)/3=6 2(x+y)-(x-y)=-4
帮我做2道数学方程(1)6x-7y-40=0 5y-2x+8=0(2)(x+y)/2+(x-y)/3=6 2(x+y)-(x-y)=-4
帮我做2道数学方程(1)6x-7y-40=0 5y-2x+8=0(2)(x+y)/2+(x-y)/3=6 2(x+y)-(x-y)=-4
因式分解:(1)、(2a-3b)(7x+y)+(x-5y)(3b-2a)(2)、(x+y)^3(x+y)^2-(-x-y)
先化简再求值(x-y)(x-2y)-1/2(2x-3y)(x+2y),其中x=2,y=2/5
先化简在求值 (x+5y)(x+4y)-(x-y)(x+y),其中,x=-2又2/3,y=3/7
(5x-y)(y+5x)-(3y+2x)(3y-2x) x=1 y=2先化简再求值
解方程:1){x-1=3(y-2)2(x-1)=5y-18; 2)2x+3y/4+2x-3y/3=7,2x+3y/3+2x-3y/2=8.1){x-1=3(y-2),2(x-1)=5y-18 2){2x+3y/4+2x-3y/3=7,2x+3y/3+2x-3y/2=8