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4(x_6.5)=1.7怎么解

x+1/4=5/6 x=5/6-1/4 x=7/12 -----------------------------------------------------------------------------------------

1/4(x-3)+1/5(x-4)+1/6(x-5)+1/7(x-6)=-4 ==>1/4x+1/5x+1/6x+1/7x-3/4-4/5-5/6-6/7=-4 ==>1/4x+1/5x+1/6x+1/7x-1+1/4-1+1/5-1+1/6-1+1/7=-4 ==> (1/4+1/5+1/6+1/7)x=-(1/4+1/5+1/6+1/7) ==> x=-1

1/x-7-1/x-5=1/x-6-1/x-4 1/x-7+1/x-4=1/x-6+1/x-5 (x-4+x-7)/(x-7)(x-4)=(x-5+x-6)/(x-6)(x-5) (2x-11)/(x^2-4x-7x+28)=(2x-11)/(x^2-5x-6x+30) (2x-11)(x^2-4x-7x+28)=(2x-11)(x^2-5x-6x+30) (2x-11)(x^2-11x+28-x^2+11x-30)=0 (2x-11)=0 x=11/2

解方程组 8x+6y=54 ① 7x-5y=1 ② 将①×7-②×8可得 7(8x+6y)-8(7x-5y)=54×7-8×1 56x+42y-56x+40y=378-8 82y=370 解得y=370/82=185/41 将y=185/41代入①可得 8x+6×185/41=54 8x=54-1110/41 8x=1104/41 解得x= 138/41 该方程组的解为x=138/41,y=185/41

1/4+x=5/6 x=5/6-1/4 x=7/12 -----------------------------------------------------------------------------------------

保证采纳我的,我来

7.4*(x-5)-6.5x=4 7.4x-37-6.5x=4 0.9x=41 x=41÷0.9 x=410/9 不懂可追问!

解:根据比例的基本性质解比例: 2/5:(1+X)=4/5:6 4/5(1+x)=2/5*6 1+x=12/5÷4/5 1+x=3 x=3-1 x=2

X-6=5x1.5

1/(x-7)+1/(x-6)=1/(x-5)+1/(x-4) 1/(x-6)-1/(x-4)=1/(x-5)-1/(x-7) 2/(x-6)*(x-4)=-2/(x-5)*(x-7) x^2-12x+35=-x^2+10x-24 2*x^2-22x+59=0 x=....用求根公式,百度里打不出来..

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