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5X(x-6.5)=1·7

= 5X-32.5=1.7 = 5X=1.7+32.5 = 5X=34.2 = X=6.84

8.1-5x=7.6 5x=8.1-7.6 5x=0.5 x=0.5/5 x=0.1 谢谢,请采纳

5x ÷ 6 = 1.7 5x = 1.7 × 6 5x = 10.2 x = 2.04 ------------- 望采纳,谢谢

5/6[6/5(2/3x-1)-2]=x-8 5/8*6/5*(2/3x-1)-5/3=x-8 2/3x-8/3=x-8 1/3x=16/3 x=16 1-1/5(x- 10-2x/3)=x/2-1/3(3x- 3-6x/2) 1-x/5-2-2x/15=x/2-x+1+x -1-x/3=-x/2+1 x/2-x/3=2 x/6=2 x=12.

:{6-5(x-2)

X-7×69=5×1.2X X-483=6X 6X-X=-483 5X=-483 X=-483÷5 X=-96.6

是不是问题不全吧,看上去无解,你自己好好努力努力,好好想想吧,再补充一下,也许就能有人回答你

[(5x+6)/8]=(15x-7)/5 两边乘以40 [25x+30]=120x-56 两边+56 [25x+86]=120x 两边除以x [25+86/x]=120 两边-25 [86/x]=95 两边除以95 [0.91x]=1 x=0.91 取 x=0.9 [25x+86]=120x 左边【25*0.9+86】=108 右边120*0.9=108

5x+4/6>=7/8-1-x/3 16/3x>=10/48 x>=5/128 当x取值大于等于5/128时,代数式5x+4/6的值不小于7/8-1-x/3。

5x(x-2.6)=25.5 5x(x-2.6)÷5=25.5÷5 x-2.6=5.1 x-2.6+2.6=5.1+2.6 x=7.7

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