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(2.6%2x)0.4=1 x等于多少

(2.6-2x)÷0.4=1 2.6-2x=0.4 2x=2.6-0.4 2x=2.2 x=2.2÷2 x=1.1

2.6-2x=1 -2x=1-2.6 x=(1-2.6)/-2 x=0.8

展开: 0.8-1.2x=2x-1.6 3.2x=2.4 x=2.4/3.2 x=0.75

两边乘以2(2x+0.6)(x-0.4)=1.562x²-0.2x-1.8=0十字交叉法1 -12 1.8(x-1)(2x+1.8)=0x=1或-0.9

解:原式=(2x+4)-(1/2x+1)+(x-6)*2 =2x+4-1/2x-1+2x-12 =(2+2-1/2)x-12+4-1 =7/2x-9

第一题: (x+2)/6-(2x-3)/4=3 2(x+2)-3(2x-3) =36 2x+4-6x+9=36 -4x=23 x=-23/4 第二题: 1/2-(x-3)/3=1 3-2x+6=6 2x=3 x=3/2

x-2/3x=1-1+1/3 1/3x=1/3 x=1

(1)x 2 +3x=4,变形得:x 2 +3x-4=0,即(x-1)(x+4)=0,可得x-1=0或x+4=0,解得:x 1 =1,x 2 =-4;(2)x(2x+3)=4x+6,变形得:x(2x+3)=2(2x+3),即(x-2)(2x+3)=0,可得x-2=0或2x+3=0,解得:x 1 =2,x 2 =- 3 2 ;(3)x 2 -2...

4^x+2×6^x-3^(2x+1)=0 即有2^2x+2*2^x*3^x-3^2x*3=0 方程二边同除以3^2x: (2/3)^2x+2(2/3)^x-3=0 [(2/3)^x+3][(2/3)^x-1]=0 (2/3)^x+3>0 故有(2/3)^x-1=0 (2/3)^x=(2/3)^0 x=0

2/3(2x-6)-1/2(2x-4)=4 4/3x-4-x+2=4 1/3x=6 x=18

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