x/15-×/12=5/60
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
x/(x/12+x/15)*(x/12-x/15)=60
(5X-15)-(2X+3)=X+12
已知x -2x=5,求代数式x四次方+3x³-12x² -31x-15
15x=23x-24 12+5x=3x-8 3(x-3)=9-(x+6)解 4+x=4x-17解
(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2
x=4x=254 5x-x=180 3x+x=16 4x-2x=28 15x-11x=12.8 (12+12*1.5)x
(2x^-5x+2/6x^+13x+6)*(6x^-5x-6/6x^-17x+10)*(12x^+8x-15/2x^-x
11x+0.5=15x-0.7 5x+12=8x+3
X/15 + X/12 + X/10 = 1365,求X,
解方程 40%x+2=12 x+25%x=10 x-30%x=1.4 15x-60=240 x+1
15X÷2=60 4X+X=3.15 3.4X+1.8=8.6 5X-X=2.4 1.5X-X=1 6.6X-6X=1.