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解方程:8X%5=23

8x-5=23 解:8X-5+5=23+5 8X=28 8X除8=28除8 X=3.5

4-5/8X=7/8 4-7/8 =5/8X 25/8 =5/8X x =25/8*8/5 X=5

1-5/8x=4分之一 解:5/8x=1-1/4 5/8x=3/4 x=3/4*8/5 x=6/5

2x=12 x=6

(1)4x2-8x-5=0(用配方法) 移项得:4x2-8x=5,则x2-2x=54,x2-2x+1=54+1,(x-1) 2=94,x-1=±32,x1=52;x2=-12.(2)4x2-25=0(用因式分解法)(2x+5)(2x-5)=0,解得:x1=-2.5;x2=2.5;(3)4(x-2)2-120=14(x-2)2-121=0,[2(x-2...

(1)35-2.5X=5, 35-2.5X+2.5X=5+2.5X, 5+2.5X=35, 5+2.5X-5=35-5, 2.5X=30,2.5X÷2.5=30÷2.5, X=12;(2)6×2.5+8X=23, 15+8X=23,15+8X-15=23-15, 8X=8,8X÷8=8÷8, X=1;(3)1.2X+1.3X-8=4.6,2.5X-8=4.6, 2.5X-8+8=4.6+8, 2.5X=1...

解:8x-4x=3+5 x=8÷4 x=2

8x-2.1X3=5.1 8x-6.3=5.1 8x=5.1+6.3 8x=11.4 x=11.4/8 x=1.425

x=2.68,x=8.97,x=3,x=2.4

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