6X 20=4(X 20)
6X 20=4(X 20)
x-20%x=4
x-(1/5+1/5)x-39=39 x-1/4x-2/5x=112 x-1/6x-1/3x-12=20
已知x-4/x=6,求代数式2x²-20x/x²-14x+4除(1-x-12/2-x)的值
4x-3x(20-x)=5x-7x(20-x)
4x-3x(20-x)=5x-7x(20-x)的解法
解一元一次方程 x/2+x/6+x/12+x/20+x/30+x/42=6
x/2+x/6+x/12+x/20+x/30+x/42=1
4(x+3)=2x+2 7(x-1)=2x+3 4x+20=6x-30 4x-12=2x 2x-3=x+7 3x-4=2
求(6x+5)(6x-5)-(4x+3)(9x-5)=-20
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20