0.6X+0.7×(30-X)=19.
解方程= =|| 60X=45(X不是乘!)1.6+0.4X=4 X-0.6X=24 80%X-30=24
55-x=7(x+1) 30-3x=0.6(4+5x) 9+2x=3(7-x)解方程,要写出全过程!
关于一元一次方程的(1)0.6x+0.3=0.9x-0.2 (2)3(x-1)-7(x+5)=30(x+1)(3)(2x
0.6x+0.7x=2.
(25%X-30)+110=15%X+X
2x(56-X)-10=30+X
4X-24=2X+20 2X(X-0.7)=4.8 0.6X+3X2.5=67.5 (X-7)除以3=8 5X-1.5X
若1+x+x*x+x*x*x=0,求x+x*x+x*x*x+.+x(2000次幂)
0.4(x-0.2)+1.5=0.7x-0.38 (0.6x+420)÷(x+20)=3
x+17=3(x+13),2x-11.2=0.6x,2.5x-2.17=21.9-5.8x,8(x-1.5)=x+0.6
先观察下列各式,(x+5)(x+6)=x²+11x+30 (x-5)(x-6)=x²-11x+30
(X+X)+(X-X)+(X*X)+(X/X)=100