作业帮7.2x加0.8x=9.6
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/15 12:07:18
等于37因为：【】都是一样的数字的话那他们就可以合并同类项：[]{10+1}*5=1980所以算出为37~
x加30%x=521.3x=52x=52×1.3x=40x减40%x=150.6x=15x=15÷0.6x=2550%x加x=31.51.5x=31.5x=31.5÷1.5x=21x减1%x=19.8
1.2x=9.6x=8
(x+7)/(x+6)+(x+9)/(x+8)=(x+10)/(x+9)+(x+6)/(x+5)(x+9)/(x+8)-(x+10)/(x+9)=(x+6)/(x+5)-(x+7)/(x+6)[(x+
2x加5乘0.8x加5（0.8x减0.2）等于292x+4x+4x-1=2910x=30x=3
答：1）x/(x^2-x)+2=2x/(x+1)1/(x-1)=2x/(x+1)-2=-2/(x+1)-2x+2=x+13x=1x=1/3经检验,x=1/3是原分式方程的解2）x/(x+1)-1=3/
x加12.5x=7.213.5X=7.2X=7.2/13.5X=5.33再问：不是循环小数么再答：是啊后面是3循环
x+4x=205x=20x=20÷5x=4
4x-3.7x=12.x=40;4.2x+2,5X=1.34,X=2;8X-3X=15,X=3;(X-3)/2=7.5,X=18;35X+13X=9.6;X=0.2小妹妹.你是不是这些题目不会做在偷懒
X+1/4X=75,X=60
x平方加X平方分之一加X减X分之一=4(x²+1/x²-2)+(x-1/x)-2=0;(x-1/x)²+(x-1/x)-2=0;(x-1/x+2)(x-1/x-1)=0；
四个一组原式=(1+x+x²+x³)+x^4(1+x+x²+x³)+……+x^1996(1+x+x²+x³)+x^2000=0+0+……+0
x²+5x+7=3x+11x²+2x+1=5（x+1）²=5x=根号5-1或x=-根号5-1
分类讨论：x>=3时,f(x)=x-3+x+3=2x-3
x/x-3减x+6/x^2-3x加3/x=[x*x-(x+6)+3(x-3)]/x(x-3)=(x^2-x-6+3x-9)/x(x-3)=(x^2+2x-15)/x(x-3)=(x+5)(x-3)/x
2x²-18=x²+x²-1+2x-18=-1+2x2x=-17x=-17/2
每个分式减去1(x-4-x+5)/(x-5)+(x-8-x+9)/(x-9)=(x-7-x+8)/(x-8)+(x-5-x+6)/(x-6)1/(x-5)+1/(x-9)=1/(x-8)+1/(x-6
1+1/(x+2)+1+1/(x+3)=1+1/(x+4)+1+1/(x+1)1/(x+2)+1/(x+3)=1/(x+4)+1/(x+1)1/(x+3)-1/(x+4)=1/(x+1)-1/(x+2
(x+7)/(x+6)+(x+9)/(x+8)=(x+10)/(x+9)+(x+6)/(x+5)1+1/(x+6)+1+1/(x+8)=1+1/(1+9)+1+1/(x+5)1/(x+6)+1/(x+
x减7.2除4等于x加9.6除8（X-7.2）/4=（X+9.6）/82X-7.2*2=X+9.6X=9.6+7.2*2X=24