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6X%1.2x0.5=3.6解方程

6X-1.2×0.5=3.6 6X=3.6+0.6 Ⅹ=4.2÷6 X=0.7

(1)46/x=2.3 x=46/2.3 x=20 (2)6x-0.2=1 6x=1+0.2 6x=1.2 x=1.2/6 x=0.2

配方啊 ( ^ 表示平方) 2X^-6X+1=0 2(X^-3X)+1=0 2(X-1.5)^-4.5+1=0 2(X-1.5)^=3.5 (X-1.5)^=1.75 答案:X1=二分之根号七+1.5 X2=二分之根号七-1.5

(1)6x+0.5×7=6.5 6x+3.5=6.5 6x+3.5-3.5=6.5-3.5 6x=3 6x÷6=3÷6 x=0.5;(2) 2.5 x =7.5:127.5x=2.5×127.5x÷7.5=30÷7.5 x=4.

(1)方程整理为:(x-1)2=9x-1=±3x=1±3∴x1=4,x2=-2;(2)2x2-4x-1=0a=2,b=-4,c=-1,△=16+8=24x=4±244∴x1=2+62,x2=2?62;(3)方程化为:(3x+4)(2x-3)=03x+4=0或2x-3=0∴x1=32,x2=?43;(4)x2-6x=391x2-6x+9=400(x-3)2=400x-3=...

0.5*(4.5+x)=20 4.5+x=40 x=40-4.5 x=35.5 6x-2.4*5=80 6x-12=80 6x=92 x=46/3 2分之1X-0.25X=10 0.25x=10 x=10÷0.25 x=40 x-5分之4-4=21 x-4.8=21 x=25.8

(1)原式=-1+7+3+5=14;(2)去分母得:x+5-3x+3=6x,移项合并得:8x=8,解得:x=1,经检验x=1是增根,分式方程无解.

(1)2.5x-0.25-2x=4; 0.5x=4.25 x=8.5 (2)两边乘以6,得3(5x+7/3)=2(6x-5/2)-(x+4) 括号打开整理得:15x+7=11x-14 4x=-21 x=-21/4

x1=-1 x2=1 x3=-1 x4=1 x5=-1

解方程。 x+1/2=2/3 x=2/3-1/2 x=1/6 x-2/9=2/3 x=2/3+2/9 x=8/9 1/4+x=5/6 x=5/6-1/4 x=7/12 5/6x=4/9 x=4/9÷5/6 x=8/15 x÷3/8=5/6 x=5/6×3/8 x=5/16 2+1/4x=5 1/4x=3 x=12

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