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(1/6X+4)÷(X+4)=1/4

参考答案如图:

设 t=6x+7,则 3x+4=(6x+7+1)/2=(t+1)/2; x+1=(6x+7-1)/6=(t-1)/6; 代入原式即得:t²(t+1)(t-1)=72; 即有t^4-t²-72=(t²-9)(t²+8)=0 由于t²+8≠0,故必有t²-9=0,于是得 t=±3; 故由6x+7=3,得x=-4/6=-2/3;由6x+...

(8)x2+0x+9=(x+它)2;(2)4x2-0x+94=4(x-它4)2.故答案为:(8)9;(x+它);(2)94;它4

1/2X4+1/4X6+1/6X8+1/8X10+1/10X12==(1/2-1/4+1/4-1/6+1/6-1/8+1/8-1/10+1/10-1/12)÷2 =(1/2-1/12)÷2=5/12÷2=5/24 1-5/6+7/12-9/20+11/30 =1/6+7/12-9/20+11/30 =(1/2-1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6) =1/2+1/6 =2/6=1/3 这里: 1/6=1/2-1...

(1-4/7)x+34=5/6x 3/7x+34=5/6x 5/6x-3/7x=34 17/42x=34 1/42x=2 x=84

解6x一4(x一2)=10 得6x-4x+8=10 即2x=2 解得x=1.

X+1/6X=1·4 (1+1/6)x=7/5 7/6x=7/5 x=6/5

6x-4(x-1)=8-3(x+3) 解:6x-4x+4=8-3x-9 6x-4x+3x=8-9-4 5x=-5 x=-1

x+1/2x+1/3x+1/6x=4 x+3/6x+2/6x+1/6x=4 2x=4 x=4÷2 x=2

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