b3:
a)l 2-3x l =-1
b)3x-2,42+0,8=3,38-0,2x
c)3/x-1 + 2/x²+x+1 = 3x²/x³-1
Những câu hỏi liên quan
Tìm x
a 5(2x-3)-4(5x-7)=19-2(x+11)
b 7(4x+3)-4(x-1)=15(x+0,75)+7
c 3x-2,42+0,8x=3,38-0,2x
d (x-1)2+(x+3)2=2(x-2)(x+1)+38
e 5(x2-2x-1)+2(3x-2)=5(x+1)2
Tìm x
a 5(2x-3)-4(5x-7)=19-2(x+11)
b 7(4x+3)-4(x-1)=15(x+0,75)+7
c 3x-2,42+0,8x=3,38-0,2x
d (x-1)2+(x+3)2=2(x-2)(x+1)+38
e 5(x2-2x-1)+2(3x-2)=5(x+1)2
Tìm x
a 5(2x-3)-4(5x-7)=19-2(x+11)
b 7(4x+3)-4(x-1)=15(x+0,75)+7
c 3x-2,42+0,8x=3,38-0,2x
d (x-1)2+(x+3)2=2(x-2)(x+1)+38
e 5(x2-2x-1)+2(3x-2)=5(x+1)2
Tìm x
a 5(2x-3)-4(5x-7)=19-2(x+11)
b 7(4x+3)-4(x-1)=15(x+0,75)+7
c 3x-2,42+0,8x=3,38-0,2x
d (x-1)2+(x+3)2=2(x-2)(x+1)+38
e 5(x2-2x-1)+2(3x-2)=5(x+1)2
1) Giải các phương trình sau:
a) 5(2x-3)-4(5x-7)=19-2(x+11)
b) 4(x+3)-7x+17=8(5x-1)+166
c) 17-14(x+1)=13-4(x+1)-5(x-3)
d) 5x+3,5+(3x-4)=7x-3(x-0,5)
e) 7(4x+3)-4(x-1)=15(x+0,75)+7
f) 3x+2,42+o,8x=3,38-0,2x
\(\text{a) 5(2x-3)-4(5x-7)=19-2(x+11)}\)
\(10x-15-20x+28=19-2x-22\)
\(10x-20x+2x=19-22-28+15\)
\(-8x=-16\)
\(\Rightarrow x=2\)
\(\text{b) 4(x+3)-7x+17=8(5x-1)+166}\)
\(4x+12-7x+17=40x-8+166\)
\(4x-7x-40x=-8+166-17-12\)
\(-43x=129\)
\(x=-3\)
\(\text{c) 17-14(x+1)=13-4(x+1)-5(x-3)}\)
\(17-14x+14=13-4x-4-5x+15\)
\(-14x+4x+5x=13-4+15-14-17\)
\(-5x=-7\)
\(x=\frac{7}{5}\)
\(\text{d) 5x+3,5+(3x-4)=7x-3(x-0,5)}\)
\(5x+3,5+3x-4=7x-3x+1,5\)
\(5x+3x-7x+3x=1,5-3,5\)
\(x=-2\)
\(\text{e) 7(4x+3)-4(x-1)=15(x+0,75)+7}\)
\(28x+21-4x+4=15x+11,25+7\)
\(28x-4x-15x=11,25+7-4-21\)
\(9x=\frac{-27}{4}\)
\(x=\frac{-3}{4}\)
\(\text{f) 3x+2,42+o,8x=3,38-0,2x}\)
\(3x+0,8x+0,2x=3,38-2,42\)
\(4x=\frac{24}{25}\)
\(x=\frac{6}{25}\)
chúc bạn học tốt !!
Tìm x
1) 2-3x5x +10
2) 13-7x 4x-20
3) 11-9x 3 -7x
4) 5( 2x -3 ) - 4 ( 5x-7) 19-2 ( x+11)
5) 4 ( x+3) -7x+17 8( 5x -1)+166
6) 17-14(x+1)13-4(x+1)-5(x-3)
7)5x-3,5+ ( 3x-4)
8) 7 (4x +3)- 4 (x-1) 15 (x+0,75)+7
9) 3x -2,42 + 0,8 3,38 - 0,2x
10) 9 ( x+3) + 6 4 ( 5x +9 )
Đọc tiếp
Tìm x
1) 2-3x=5x +10
2) 13-7x =4x-20
3) 11-9x =3 -7x
4) 5( 2x -3 ) - 4 ( 5x-7) = 19-2 ( x+11)
5) 4 ( x+3) -7x+17= 8( 5x -1)+166
6) 17-14(x+1)=13-4(x+1)-5(x-3)
7)5x-3,5+ ( 3x-4)
8) 7 (4x +3)- 4 (x-1)= 15 (x+0,75)+7
9) 3x -2,42 + 0,8= 3,38 - 0,2x
10) 9 ( x+3) + 6 = 4 ( 5x +9 )
Giải các phương trình sau
A.5+3x=4x-9
B.3,2x-5(x-0,2)=5+0,2x
C.1,5-(x+2)=-3(x+0,1)
E.2/3-1/2(x+2)=-x+1
F.3t-4+13+2(t+2)-3t
A 3x-4x=-9-3
-x=-12
x=12
B 3.2x -5x +1=5+0.2x
3.2x-5x-0.2x=5-1
-2x=4
x=-2
C 1.5-x-2=-3x-0.3
-x+3x=-0.3-1.5+2
2x =0.2
x=0.1
E 2/3-1/2x-1=-x+1
-1/2x+x=1+1-2/3
1/2x=4/3
x=8/3
F 3t-4+13+2t+4-3t
=3t+2t-3t-4+13+4
=2t+13
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B1. Tính giá trị: A=(x+2)^2 - (x-2)^2 với x=125
B2. Thu gọn:
a, 2x.(2x-1)^2 - 3x.(x+3).(x-3) - 4x.(x+1)^2
b. (3x+1)^2 - 2.(3x+1).(3x+5) + (3x+5)^2
B3: Tìm x biết (x+2)^2 - x^2 +4=0
b1
A=(125+2)2 - (125-2)2 = 1272 - 1232 = 1000
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Thu gọn biểu thức: A = ( 3x - 1 ) - 2 * l x + 3 l
B = 25 - 3x2 + 3 + l 3x2 + 1 l + l x - 1 l
C = 2 * l x - 3 l - l 4x - 1 l