X/(70+60)-X/(70+50)=1
x/(60+70)+1=x/(50+70)怎么解
x-(20%*X +20%*X+50)=70怎么解?
60x+70(100-x)=6300
(X-1)(X-2)=70,(3-X)²+2X(X-1)=0,-3X²-4X+4=0,(3-X)
解方程:x-15%x=34 x+120%z=180 40%x=60 70%x-45%x=100 1/4x+20%x=9
解方程:70%x+(70%x-2)=(x+130%x-2)×60%
20*X+30*3X+70*(50-X-3X)=1800
x除55%=100 60%x=30 x+50%x=4.5 (1-25%)x=72 4x+40%x=176 解方程
30X-2X=84 5.8X-X=60 6.6X-5X=8 4X-X=24 1.5X-X=1
解方程 90-20%x=80 x-25%x=21 x+60%x=3.2 70%x+46=60 (1-75%)x=36 3
24x+9.6x=84 14.3x-7.6x=33.5 7x+8x-10x=70
x-1)(X-2)(x-3)...(x-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2)