8*0.85(x+45)-8X=12(45+x-35)-12x

来源：学生作业帮编辑：大师作文网作业帮分类：数学作业时间：2024/11/17 04:09:21

8 X 0.85(x + 45) - 8x = 12(45 + x - 35) -12x
4 X[ 2X 0.85(x + 45) - 2x ] = 4 X[ 3(10 + x) - 3x ]
1.7(x + 45) - 2x = 3x + 30 - 3x
1.7x + 45X1.7 - 2x = 30
45X1.7 - 0.3x = 30
45X17 - 3x = 300
15X17 - x = 100
x = 255 -100
x = 155

8*0.85(x+45)-8X=12(45+x-35)-12x 8[0.85(45+x)-x]=12(45+x-35-x ) (x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2 x/2+x/8+x/12+x/20=1 【85%X-（X-45）】×8=【（X-30）-（X-45）】×12 1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550 Y-X=45 (85%Y-X)×8=(Y-35-X)×12 Y-X=45 (80%Y-X)×8=(Y-35-X)×12 (2x^-5x+2/6x^+13x+6)*(6x^-5x-6/6x^-17x+10)*(12x^+8x-15/2x^-x x-o.8x=6 12x-8x=4.8 3x-8=16 7.5x-2x x-0.7x=3.6 求答案解方程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