解方程:(1)(1—2x)/3=(3x+1)/7—3;(2)(0.4x—9/0.5)—(x—5/2)=(0.03+0.02x)/0.033.已知x=1/2是方程(2x—m)/4—(1/2)=(x—m)/3的解,求代数式1/4(-4m+2m—8)—(1/2m—1)的值 (为了
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![解方程:(1)(1—2x)/3=(3x+1)/7—3;(2)(0.4x—9/0.5)—(x—5/2)=(0.03+0.02x)/0.033.已知x=1/2是方程(2x—m)/4—(1/2)=(x—m)/3的解,求代数式1/4(-4m+2m—8)—(1/2m—1)的值 (为了](/uploads/image/z/4337065-1-5.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%EF%BC%9A%EF%BC%881%EF%BC%89%EF%BC%881%E2%80%942x%EF%BC%89%2F3%3D%EF%BC%883x%2B1%EF%BC%89%2F7%E2%80%943%EF%BC%9B%EF%BC%882%EF%BC%89%EF%BC%880.4x%E2%80%949%2F0.5%EF%BC%89%E2%80%94%EF%BC%88x%E2%80%945%2F2%EF%BC%89%3D%EF%BC%880.03%2B0.02x%EF%BC%89%2F0.033.%E5%B7%B2%E7%9F%A5x%3D1%2F2%E6%98%AF%E6%96%B9%E7%A8%8B%EF%BC%882x%E2%80%94m%EF%BC%89%2F4%E2%80%94%EF%BC%881%2F2%EF%BC%89%3D%EF%BC%88x%E2%80%94m%EF%BC%89%2F3%E7%9A%84%E8%A7%A3%2C%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8F1%2F4%EF%BC%88-4m%2B2m%E2%80%948%EF%BC%89%E2%80%94%EF%BC%881%2F2m%E2%80%941%EF%BC%89%E7%9A%84%E5%80%BC+%EF%BC%88%E4%B8%BA%E4%BA%86)
解方程:(1)(1—2x)/3=(3x+1)/7—3;(2)(0.4x—9/0.5)—(x—5/2)=(0.03+0.02x)/0.033.已知x=1/2是方程(2x—m)/4—(1/2)=(x—m)/3的解,求代数式1/4(-4m+2m—8)—(1/2m—1)的值 (为了
解方程:(1)(1—2x)/3=(3x+1)/7—3;(2)(0.4x—9/0.5)—(x—5/2)=(0.03+0.02x)/0.03
3.已知x=1/2是方程(2x—m)/4—(1/2)=(x—m)/3的解,求代数式1/4(-4m+2m—8)—(1/2m—1)的值 (为了看起来方便我加了括号)哪位有爱的亲帮帮我~感激!
解方程:(1)(1—2x)/3=(3x+1)/7—3;(2)(0.4x—9/0.5)—(x—5/2)=(0.03+0.02x)/0.033.已知x=1/2是方程(2x—m)/4—(1/2)=(x—m)/3的解,求代数式1/4(-4m+2m—8)—(1/2m—1)的值 (为了
1.(1-2x)/3=(3x+1)/7-3
7-14x=9x+3-63
23x=67
x=67/23
2.(0.4x-9/0.5)-(x-5/2)=(0.03+0.02x)/0.03
2x/5-18-x+2.5=1+2x/3
6x-270-15x+37.5=15+10x
19x=-247.5
x=-495/38
3.将x=1/2代入方程
(1-m)/4-1/2=1/6-m/3
3-3m-6=2-4m
m=5
代入代数式,得
(-20+10-8)/4-(5/2-1)
=-9/2-3/2
=-6
1.(1-2x)/3=(3x+1)/7-3
7-14x=9x+3-63