1) 5x+5x+2=650
5x.1+5x.52=650
5x(1+52)=650
5x(1+25)=650
5x.26=650
5x=650:26=25=52
=> x=2
2) 3x-1+5.3x-1=162
3x-1.1+5.3x-1=162
3x-1(1+5)=162
3x-1.6=162
3x-1=162:6=27=33
=> x-1=3
x=3+1=4
3) 23x+2=4x+5
23x.22=4x.45
23x+2=(2.2)x.(2.2)5=2x.2x.25.25=22x.25+5=22x.210=22x+10
=> 3x+2=2x+10
3x+2-2x=10
3x-2x=10-2=8
x=8
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Bài : Rút gọn
1) (3x - 5).(7-5x)-(5x+2).(2-3x)
2) (3x2+5x-2).(2x2-4x+3)
3) (3x2+5x-2).(2x2-4x+3)
4)4(2x3+x)-(2x-1)(4x2+3x+1)
5) 2x(x+3)-(x-5).(7+2x)
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Tìm x biết:
a) 4(18-5x) - 12(3x-7) = 15(2x-16) - 6(x+14)
b) 5(3x+5) - 4(2x-3) = 5x+3(2x+12)+1
c)2(5x-8) - 3(4x-5) = 4(3x-4) + 11
d) 5x-3 {4x-2 [4x-3(5x-2)]}=182
Tìm x biết :
a, 4.(18 - 5x) - 12.(3x - 7) = 15.(2x - 16) - 6(x + 14)
b, 5.(3x + 5) - 4.(2x - 3) = 5x + 3.(2x + 12) + 1
c, 2.(5x - 8) - 3.(4x - 5) = 4.(3x - 4) + 11
d, (3x + 2)(2x + 9) - (x + 2)(6x + 1) = (x + 1) - (x - 6)
e, (8x - 3)(3x + 2) - (4x + 7)(x + 4)= (2x + 1)(5x - 1) - 33
a , | 4x + 2020 | = 0
b , | 2x + 1/4 | + | -5 | = | -14 |
c , | 2020 - 5x | - | 3 | = - | -8 |
d , | x mũ 2 + 4x | = 0
e , | x-1 | + 3x = 1
g , | 2-3x | + 3x = 2
h , | 5x-4 | + 5x = 4
i , | x - 1/4 | - | 2x + 5 | = 0
k , | 5x - 7 | - | 8-5x | = 0
n , | x mũ 3 - 4x | =0
Tìm x biết:
a) (2x + 3)/(5x +2) = (4x + 5)/(10x + 2)
b) (3x - 1)/(40 - 5x) = (25 - 3x)/(5x - 34)
Bài 2 Tìm x biết 1, (2x-2).(3x+1)-(3x-2).(2x-3)=5 2,(1-3x).(3x-5)-(2x-4)(2-3x)=x-6 3,(2x-1).(4x^2+2x+1)-(2x+1)(4x^2-2x+1)=5x+6 Giúp tớ với
a) -5(x^2 - 3x +1 ) + x ( 1+5x ) =x-2
b) -4x (x-5) +7x (x-4) -3x^2 =12
Bài 3: Tìm bậc của các đa thức sau:
a) 2x – 5xy + 3x 2
b) ax 3 + 2xy – 5 ( a là hằng số)
c) 5x 3 – 4x + 7x 2 – 8x 3 + 4x + 1 – 5x 2
d) -3x 5 - x 3 y - xy 2 + 3x 5 + 2
a)(2x^2-x+3)-(x^2-4x+2)+(x^2-5x-1)
b)(-3x^2+2x-5)-(4x^-2x-7)+(3x^2-8x+1)
tìm x biết
a, -5 (x^2 - 3x + 1 ) + x ( 1 +5x) = x-2
b,-4x ( x - 5 ) + 7x (x - 4 ) - 3x^ 2 = 12