30x=4/5y 40(x-1)=y+25 1/3(x+y)=33-1/2x=2(3-1/2y)
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30x=4/5y 40(x-1)=y+25 1/3(x+y)=33-1/2x=2(3-1/2y)
初二上学期方程题 4x+y=5 5x+4y=63x-2y=1 2x+3y=13x-2y=7 7x+5y=32x+3y=17 2x-y=-4x+5y=6 2x+y=23x-6y=4 3x+2y=52x+y=73x-4y=53x+y=1x-2y=-1x+y=42x+3y=92x-3y=74x+5y=3x+y=20004x+6y=90003x+5y=113x-2y=42x+3y=215x-2y=5x+y=54x+3y=182x+3y=16x+4y=132x+3y=40x
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
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
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
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
{x/60+y/80=10,x/60+y/40=15、{2x/3+3y/4=1/5,5x/6-5y/2=2、{5/2(x+y)=1200,10/3(x+y)=1200{4x+5y=98,5y-4x=2、{x/3+y/4=54/60,y/4+x/5=42/60怎么解?{40-y=x-4 40-y=y-x
方程组:x(y+1)+2(y+1)=y(y-1)x-5(y-1) x(4+y)-y(8-x)=-20x(y+1)+2(y+1)=y(y-1)x-5(y-1) x(4+y)-y(8-x)=-20(这是一个方程组.)
化简求值(x+5y)(x+4y)-(x-y)(x+y),其中x=一又2/5,y=-1/7
(1)x+y=420,30%x+40%y=160×80% (2)x-y/7-x+y/6=1/2,2(x-y)-5(x+y)+1=0,求方程组解嗷嗷嗷!
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
解方程组:(0.2x+0.1y)/2- (4x-y)/10=(x-y)/5+ (3x+0.5y)/30 (3x+2y-1)/8=3-(0.8x-5y)/41=-=
.先化简再求值:(2x+y)(2x+y)-(2x-y)平方其中X,Y满足X平方+Y平方-2X+4Y+5=0
若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是()
[(x+2y)²-(x+y)(3x-y)-5y²]÷(2x),其中x,y满足x²+4x+y²-y+17/4=0已知、x+y=6且xy=4(1)x²+y² (2)(x-y)² (3)x{四次方}+y{四次方}第一题没错 书上就这样写的!
{5(x-3y)-6=2x+1 3(x+6y)+4=9y+19 {3分之2(x-y)=4分之x+y-1 6)x+y)=4(2x-y)+16