Đáp án:
Giải thích các bước giải:
1)x-1/5=7/15x3/5
x-1/5=7/25
x=7/25+1/5
x=7/25+5/25
x=12/25
2)3/4-1/4x=-1+7/8
3/4-1/4x=-8/8+7/8
3/4-1/4x=-1/8
1/4x=3/4- -1/8
1/4x=6/8+1/8
1/4x=7/8
x=7/8:1/4
x=7/8x4/1
x=7/2
3)-3/4+3/4(x-1/2)+1/6=-1
3/4(x-1/2)=-1+3/4-1/6
3/4(x-1/2)=-12/12+9/12-2/12
3/4(x-1/2)=-5/12
x-1/2=-5/12:3/4
x-1/2=-5/12x4/3
x-1/2=-5/9
x=-5/9+1/2
x=-10/18+9/18
x=-1/18
4)2/3+1/3:3x=20%
2/3+1/3:3x=1/5
1/3:3x=1/5-2/3
1/3:3x=3/15-10/15
1/3:3x=-7/15
3x=1/3:-7/15
3x=1/3x15/-7
3x=-5/7
x=-5/7:3
x=-5/7x1/3
x=-5/21
5)(1 và 2/3-2x)x75%-2=13/16
(5/3-2x)x3/4-2=13/16
(5/3-2x)x3/4=13/16+2
(5/3-2x)x3/4=13/16+32/16
(5/3-2x)x3/4=45/16
(5/3-2x)=45/16:3/4
(5/3-2x)=45/16x4/3
(5/3-2x)=15/4
2x=5/3-15/4
2x=20/12-45/12
2x=-25/12
x=-25/12:2
x=-25/12x1/2
x=-25/24
7)2/7+Ix-1/2I=1
Ix-1/2I=1-2/7
Ix-1/2I=7/7-2/7
Ix-1/2I=5/7
x-1/2=5/7 hay x-1/2=-5/7
x=5/7+1/2 hay x=-5/7+1/2
x=10/14+7/14 hay x=-10/14+7/14
x=17/14 hay x=-3/14
8)(x-1/2)^2+1 và 9/25=2
(x-1/2)^2+34/25=2
(x-1/2)^2=2-34/25
(x-1/2)^2=50/25-34/25
(x-1/2)^2=16/25
(x-1/2)^2=(4/5)^2
x-1/2=4/5
x=4/5+1/2
x=13/10
9)1/2x+3/8x=0,75
(1/2+3/8)x=0,75
(4/8+3/8)x=0,75
7/8x=3/4
x=3/4:7/8
x=3/4x8/7
x=9/7
10)3/4x+1/2(x+2)=-11/4
3/4x+1/2x+x=-11/4
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