0.5x+(5x+20)*0.5=298 x
0.5x+(5x+20)*0.5=298 x
5*(x-2)=4*(x+3) 2x+(50-x)*4=140 3x-(8-x)=20*4 200x=(x-0.5)*2
4X减0.5X等于1.75 X除0.63=12 5X加X=20 5X减3X=3.2
4X+0.5X=13.5X
x-0.5x=20+0.3x解方程
0.5(x+x-20)=84
20%x+12=0.5x
x+0.5x=30
求1/2x^2-1/4x+0.2x^3+0.25x-0.5x^2-1/5x^3+0.5x-1 其中x=12/13
用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+.
解方程;2(X-0.7)=4.8 1/8(X+0.5)=75% 9*8-4X=60 5X-20%X=19.2 3X-0.
4x-3x(20-x)=5x-7x(20-x)