4x-5[1120÷13-10x÷13]=40
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
1. x+0.5x=6 4x+16=40 x/5=32% x-4/9x=10/21 x-1/8x=5/8 7x÷2=2.
二元一次方程组:3x+5x=13 4x+3x=10
二元一次方程组:3x+5x=13,4x+3x=10
13-2x=4,3x+4×0.5,5(x+4)=55,9÷1.5x=8,1.3x+x=13.8,x-0.7x=6.9,2
当x=9/2时,求(x^2+7x+10)/(x^2+6x+5)×(x^3+1)/(x^2+4x+4)÷(x^2-x+1)
4x+9x=13x
(2x^-5x+2/6x^+13x+6)*(6x^-5x-6/6x^-17x+10)*(12x^+8x-15/2x^-x
13X-4(2X+5)=2(X+11)
x-x/5=2.4 (求未知数x) 12÷5%x=8 4x+x=12.5
x+5.7=10 x -6.2=10.5 3x=10.5 x÷7=54-5 4x+6=16 5x+x=12 7x-2x=
解方程,写出步骤 6x+7+5x=18 13x+14-5x=30 10x-8+4x=10 9x-9-7x=7 5x+6+