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X+7/8X=2/5X=( )

X+7/8X=2/5 15/8x=2/5 x=2/5÷15/8 x=16/75

x=1.8

x/8+1/16=75% (2x+1)/16=75/100 100(2x+1)=75*16=1200 200x=1200-100 200x=1100 x=11/2=5.5

如图

(1) 5x+2x=7-7 x=0 (2) 6x-8x=8-4 -2x=4 x=-2 (3) 3x-x=4+2 2x=6 x=3

解:(1)去括号得:15x﹣21﹣32x﹣12=1,移项得:15x﹣32x=1+21+12,合并同类项得:﹣17x=34,∴x=﹣2.解:(2)去分母得:2(2x+1)﹣(5x﹣1)=6,去括号得:4x+2﹣5x+1=6,移项得:4x﹣5x=6﹣1﹣2,合并同类项得:﹣x=3,∴x=﹣3.

1.-4 2.-1 3.16/3 4.1 5.18/13 6.15/7

(1)去分母得:3x2-6x-3x-6=3x2-12,即-9x=-6,解得:x=23,经检验x=23是分式方程的解;(2)方程变形得:(x?5)2?(x?4)(x?6)(x?4)(x?5)=(x?7)2?(x?6)(x?8)(x?6)(x?7),整理得:1?20x(x?4)(x?5)=1?20x(x?6)(x?7),当1-20x=0,即x=120时,经检验...

(1)5x+28=71, 5x+28-28=71-28, 5x=43, 5x÷5=43÷5, x=8.6;(2)8.7-1.2x=3.9,8.7-1.2x+1.2x-3.9=3.9+1.2x-3.9, 4.8=1.2x, 1.2x=4.8, 1.2x÷1.2=4.8÷1.2, x=4;(3)8x-2.6x=37.8, 5.4x=37.8, 5.4x÷5.4=37.8÷5.4, x=7;(4)0.75x-0...

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