9y-3y=3.6怎么算

9y-3y=3.6怎么算 9-3y=5y=5怎么算 9-5y=5+3y 怎么算 =y(y+3)-4(y+3)²=(y+3)(y-4y-12)怎么算的 2(y+2)-3(4y-1)=9(1-y)一元一次怎么算? 10y+2(7y-2)=5(4y+3)+3y怎么算 8y+12=9y-2怎么算 9y+4=7y-3怎么解 9-3y=5y+5 方程怎么解? (y-x)(x-y)^3(y-x)^5怎么算 16y -2.5y -7.5y=5怎么算 16y -2.5y -7.5y=多少怎么算 y/(x+y)-x/(x-y)=?怎么算? x+x+x+y+y=6.4 y+y+y+x+x=7.1 怎么算? 3X+4Y=5 -7Y+9Y= 负二分之五怎么算要过程 Y的平方+3Y-1=0 y+3-1/y=0 y-1/y=-3 (y-1/y)^2=9 y^2+1/y^2-2=9 y^2+1/y^2=11 (y^2+1/y^2)=121 y^4+1/y^4+y^2+1/y^2-2=9y^2+1/y^2=11那个-2是怎么来的? 3y-0.5=0.5y-x、解是y=-5/3怎么算3y-0.5=0.5y-x、解是y=-5/3 谁教教这个怎么算啊?3y + 5 / 2y = 2y - 6 / 5y求y的值是多少,(3y + 5) / 2y = (2y - 6) / 5y