-5x^2 (4x^2-5x+7)
câu 2: -3x(3/4x^2+2x-3)
Câu 3:(x^2-1) (x^2+2x)
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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)
Nhanh + đúng auto tick :Đ!
Rút gọn
a, (x-2).(3x-1).(3x+1)-2x.(4x-3)^2
b, ( 5x-7)^2 - ( 4x -3).(2x+3)^2- (x-3).(3x^2-5)
c, (2-5x)^2-4x.(3x+1)^2-(x-3).(x+3)
Rút gọn
a, (x-2).(3x-1).(3x+1)-2x.(4x-3)^2
b, ( 5x-7)^2 - ( 4x -3).(2x+3)^2- (x-3).(3x^2-5)
c, (2-5x)^2-4x.(3x+1)^2-(x-3).(x+3)
Giúp em với ạ ! Em cần gấp !
Câu 1 :
a, ( x^5 + 4x^3 - 6x^2 ) : 4x^2
b, x ( 2x^3 - 3 ) - x^2 ( 5x + 1 ) + x^2
c, ( x - 2 )^2 - ( x - 1 )( x + 1 ) - x ( 1 - x )
d, 1/2 x^2 ( 6x - 3 ) - x ( x^2 + 1/2 ) + 1/2 ( x + 4 )
Câu 2 :
a, x^3 + x + 5x^2 + 5
b, x^2 + 2xy - 9 + y^2
c, x^2 - 3xy - 10y^2
d, 2x^2 - 5x - 7
Câu 3 :
a, x^3 - 3x + 1 - 3x^2
b, 2x^2 + 4x + 2 - 2y^2
em mới học lớp 7 à chị
k em nha
thanks
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Tìm x:
1/ 4.(18-5x)-12.(3x-7)=15.(2x-16)-6.(x+14) 2/5.(3x+5)-4(2x-3)=5x+3.(2x+12)+1 3/2.(5x-8)-3(4x-5)=4(3x-4)+11 4/5x-3.{4x-2.[4x-3(5x-2)]}=182
a, \(4\left(18-5x\right)-12\left(3x-7\right)=15\left(2x-16\right)-6\left(x+14\right)\)
\(\Rightarrow72-20x-36x+84=30x-240-6x-84\)
\(\Rightarrow-20x-36x-30x+6x=-240-84-72-84\)
\(\Rightarrow-80x=-480\Rightarrow x=6\)
b, \(5\left(3x+5\right)-4\left(2x-3\right)=5x+3\left(2x+12\right)+1\)
\(\Rightarrow15x+25-8x+12=5x+6x+36+1\)
\(\Rightarrow15x-8x-5x-6x=36+1-25-12\)
\(\Rightarrow-4x=0\Rightarrow x=0\)
c, \(2\left(5x-8\right)-3\left(4x-5\right)=4\left(3x-4\right)+11\)
\(\Rightarrow10x-16-12x+15=12x-16+11\)
\(\Rightarrow10x-12x-12x=-16+11+16-15\)
\(\Rightarrow-14x=-4\Rightarrow x=\dfrac{2}{7}\)
d, \(5x-3\left\{4x-2\left[4x-3\left(5x-2\right)\right]\right\}=182\)
\(\Rightarrow5x-3\left[4x-2\left(4x-15x+6\right)\right]=182\)
\(\Rightarrow5x-3\left(4x-8x+30x-12\right)=182\)
\(\Rightarrow5x-12x+24x-90x+36=182\)
\(\Rightarrow-73x=182-36\)
\(\Rightarrow-73x=146\Rightarrow x=-2\)
Chúc bạn học tốt!!!
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Tìm x :( bài 14 trang 11 sách bồi dưỡng năng lực tự học toán 8)Câu 2 : (2x+3)2+(x-1)*(x+1)5*(x+2)2-(x-5)*(x+1)+(x+4)2Câu 3 : (-x+5)*(x-2)+(x-7)*(x+7)(3x+1)2-(C)*(3x+2)Câu 4 : (5x-1)*(x+1)-2(x-3)2(x+2)*(3x-1)-(x+4)2+(x2-x)Câu 5 : (4x-1)2-(3x+2)*(3x-2)(7x-1)*(x+2)+(2x+1)2-(3x+2)Câu 6 : (2x+3)2-(5x-4)*(5x+4)(x+5)2-(3x-1)*(7x+2)-(x2-1+1)Câu 7 : (1-3x)2-(x-2)*(9x+1)(3x-4)*(3x+4)-9(x+3)2Câu 8 : (3x+4)*(3x-4)-(2x+5)(x-5)+(2x+1)2-(x2-2x)+(x-1)2Câu 9 : (x-7)*(x+1)-(x-3)2(3x-5)*(3x+5)-(3x+1)+(x-2)2-x2Câu...
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Tìm x :( bài 14 trang 11 sách bồi dưỡng năng lực tự học toán 8)
Câu 2 : (2x+3)2+(x-1)*(x+1)=5*(x+2)2-(x-5)*(x+1)+(x+4)2
Câu 3 : (-x+5)*(x-2)+(x-7)*(x+7)=(3x+1)2-(C)*(3x+2)
Câu 4 : (5x-1)*(x+1)-2(x-3)2=(x+2)*(3x-1)-(x+4)2+(x2-x)
Câu 5 : (4x-1)2-(3x+2)*(3x-2)=(7x-1)*(x+2)+(2x+1)2-(3x+2)
Câu 6 : (2x+3)2-(5x-4)*(5x+4)=(x+5)2-(3x-1)*(7x+2)-(x2-1+1)
Câu 7 : (1-3x)2-(x-2)*(9x+1)=(3x-4)*(3x+4)-9(x+3)2
Câu 8 : (3x+4)*(3x-4)-(2x+5)=(x-5)+(2x+1)2-(x2-2x)+(x-1)2
Câu 9 : (x-7)*(x+1)-(x-3)2=(3x-5)*(3x+5)-(3x+1)+(x-2)2-x2
Câu 10 : -5(x+3)2+(x-1)*(x+1)+(2x-3)=(5x-2)2-5x(5x+3)
Các bạn giúp mình nhé càng nhanh càng tốt nhà(5x-1). (2x+3)-3. (3x-1)0x^3 (2x-3)-x^2 (4x^2-6x+2)0x (x-1)-x^2+2x5(3x+2)(x-1)-3 (5x+2)+5 (11-4x)258 (x-2)-2 (3x-4)25(3x+4). (5x-1)+(5x+2). (1-3x)+20(5x-1). (2x+7)-(2x-3). (5x+9)4 (x-1). (X+5)-(x+5). (X+2)3. (X-1)(x+2)2x^2+3 (x-1). (X+1)5x(x+1)4. (18-5x)-12 (3x-7)1825. (2x-16)-6 .(x+4)1/2x. (2/5-4x)+(2x+5).x-13/2 Nhiều các bạn giả đùm mình nhaThanh nhiều
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Các bạn giúp mình nhé càng nhanh càng tốt nhà
(5x-1). (2x+3)-3. (3x-1)=0
x^3 (2x-3)-x^2 (4x^2-6x+2)=0
x (x-1)-x^2+2x=5
(3x+2)(x-1)-3 (5x+2)+5 (11-4x)=25
8 (x-2)-2 (3x-4)=25
(3x+4). (5x-1)+(5x+2). (1-3x)+2=0
(5x-1). (2x+7)-(2x-3). (5x+9)
4 (x-1). (X+5)-(x+5). (X+2)=3. (X-1)(x+2)
2x^2+3 (x-1). (X+1)=5x(x+1)
4. (18-5x)-12 (3x-7)=1825. (2x-16)-6 .(x+4)
1/2x. (2/5-4x)+(2x+5).x=-13/2
Nhiều các bạn giả đùm mình nha
Thanh nhiều
+) (5x-1). (2x+3)-3. (3x-1)=0
10x^2+15x-2x-3 - 9x+3=0
10x^2 +8x=0
2x(5x+4)=0
=> x=0 hoặc x= -4/5
+) x^3 (2x-3)-x^2 (4x^2-6x+2)=0
2x^4 -3x^3 -4x^4 + 6x^3 - 2x^2=0
-2x^4 + 3x^3-2x^2=0
x^2(-2x^2+x-2)=0
-2x^2(x-1)^2=0
=> x=0 hoặc x=1
+) x (x-1)-x^2+2x=5
x^2 -x -x^2+2x=5
x=5
+) 8 (x-2)-2 (3x-4)=25
8x - 16-6x+8=25
2x=33
x=33/2
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câu 1:giải các pt và bpt sau: a,17x - 5(x+3)= 2x + 5 b,3/x+2 - 5/x-2 = 11x + 23/(x+2)(x-2) c,5x + 7 ≥ 3(x-1) d,3x-1/x+1 = -2/5 e,(2x-1)(2x+1)= 4x2 + 3x + 2 f,x-3^3 -7+3x g,7x-5 < 2(4x-1)+7
a: =>17x-5x-15-2x-5=0
=>10x-20=0
=>x=2
b: =>\(\dfrac{3x-6-5x-10}{\left(x+2\right)\left(x-2\right)}=\dfrac{11x+23}{\left(x+2\right)\left(x-2\right)}\)
=>11x+23=-2x-16
=>13x=-39
=>x=-3(nhận)
c: =>5x+7>=3x-3
=>2x>=-10
=>x>=-5
d: =>5(3x-1)=-2(x+1)
=>15x-5=-2x-2
=>17x=3
=>x=3/17
e: =>4x^2-1-4x^2-3x-2=0
=>-3x-3=0
=>x=-1
g: =>7x-5-8x+2-7<0
=>-x-10<0
=>x+10>0
=>x>-10
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câu 1:giải các pt và bpt sau:
a,17x - 5(x+3)= 2x + 5
b,3/x+2 - 5/x-2 = 11x + 23/(x+2)(x-2)
c,5x + 7 ≥ 3(x-1)
d,3x-1/x+1 = -2/5
e,(2x-1)(2x+1)= 4x2 + 3x + 2
f,x-3^3 -7+3x
g,7x-5 < 2(4x-1)+7
a: =>17x-5x-15-2x-5=0
=>10x-20=0
=>x=2
b: =>\(\dfrac{3x-6-5x-10}{\left(x+2\right)\left(x-2\right)}=\dfrac{11x+23}{\left(x+2\right)\left(x-2\right)}\)
=>11x+23=-2x-16
=>13x=-39
=>x=-3(nhận)
c: =>5x+7>=3x-3
=>2x>=-10
=>x>=-5
d: =>5(3x-1)=-2(x+1)
=>15x-5=-2x-2
=>17x=3
=>x=3/17
e: =>4x^2-1-4x^2-3x-2=0
=>-3x-3=0
=>x=-1
g: =>7x-5-8x+2-7<0
=>-x-10<0
=>x+10>0
=>x>-10
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