(0.3-x)(50+10x/0.1)=12
(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2
X/15 + X/12 + X/10 = 1365,求X,
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
2x-10=15x+30,6x-6=6x+2,9-3x=2x-8,5x=9x-50 ,5y-5=12-6y,15x-9=
解方程x²+x-6分之5x+x²-x-12分之2x-5=x²-6x+8分之7x-10
解分式方程(5-2x)/(x^2-x-12)=5x/(x^2+x-6)+(10-7x)/(x^2-6x+8)得
解方程.(5x/x²+x-6)+(2x-5/x²-x-12)=7x-10/x²-6x+8
130%x+x=4.6 x÷50%=10 x/9-x/15=16%
20%x+[25*(20%x)]+12=50%x+2
12x-10x=3.6 x=?
12分之x+10=7X分之x+2
12/7x(x+10)=x+2