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3x 2x

30/(3+2)=6

3x+2x=(3+2)x运用了乘法分配律

2x²+1=3x 2x²-3x+1=0 x²-3/2x+1/2=0 x²-2×3/4x+(3/4)²-1/16=0 (x-3/4)²=1/16 x-3/4=±1/4 x=1/4+3/4=1 或者 x=3/4-1/4=1/2

如题:2x+2=3x-3 解:2x-3x=-3-2 (2-3)x=-5 即 -x=-5 所以得出 x=5 套入上题即为:2*5+2=3*5-3 即 12=12 正确!

解:a=3,b=-2 c=-1 △=4+12=16 ∴x=(2+-4)/6 ∴x1=1 ,x2=-1/3

1/3x+5=1/2x 两边乘以6得 2x+30=3X 3x-2x=30 x=30 (1—25%)x=45—1/2x 75%x=45-1/2x 3/4x+1/2x=45 5/4x=45 x=36

负3小于x

(3x-1)(2x+1) =6x²+3x-2x-1 =6x²+x-1

2x²+1=3x 2x²-3x=-1 两边同除以2得: x²-3/2x=-1/2 (x-3/4)²=-1/2+9/16 (x-3/4)²=1/16 x-3/4=±1/4 x=(3±1)/4 x=1或x=1/2

2x-2-x+2=12-3x 2x-x+3x=12+2-2 4x=12 x=3

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