Rút gon:
[16a^2-(4a-5)^2]^2-[9a^2-(3a+5)^2]^2
(x-3)^3-(x+3)^3
(1/2a+b)^3+(1/2a-b)^3
(x+5)^3-x^3-125
(x-2)(x+2)(x+3)-(x+1)^3
(x+2)^3-(x-2)^3-12x^2
Những câu hỏi liên quan
Rút gon: [16a^2-(4a-5)^2]^2-[9a^2-(3a 5)^2]^2
(x-3)^3-(x 3)^3 (1/2a b)^3 (1/2a-b)^3 (x 5)^3-x^3-125 (x-2)(x 2)(x 3)-(x 1)^3 (x 2)^3-(x-2)^3-12x^2
Rút gon: [16a^2-(4a-5)^2]^2-[9a^2-(3a 5)^2]^2
(x-3)^3-(x 3)^3
(1/2a b)^3 (1/2a-b)^3
(x 5)^3-x^3-125
(x-2)(x 2)(x 3)-(x 1)^3
(x 2)^3-(x-2)^3-12x^2
Rút gọn
a) A=3(x+1)^2/x^3-1 - 1-x/x^2+x+1 + 3/1-x
b) B= 2a/a^2-3a + a/a-1 + 2a/a^2-4a+3
Giải zùm mk vs
Thực hiện phép tính,rút gon bt:
\(\dfrac{3}{2x+6}-\dfrac{x-6}{2x^2+6x}\)
\(\dfrac{4a^2-3a+5}{a^3-1}-\dfrac{1-2a}{a^2+a+1}+\dfrac{2y^2a-1}{ }\)
Bài 1. Thu gọn:a) x2 – 4 – (x + 2)2b) (x + 2)(x – 2) – (x – 3)(x + 1)c) (x – 2)(x + 2) – (x – 2)(x + 5)d) (6x + 1)2 + (6x – 1)2 – 2(6x + 1)(6x – 1)e) 7a(3a – 5) + (2a -3)(4a + 1) – (6a – 2)2g) (5y – 3)(5y + 3) – (5y – 4)2h) (3x + 1)3 – (1 – 2x)3i) (2x + 1)2 + 2(4x2 – 1) + (2x – 1)2
Đọc tiếp
Bài 1. Thu gọn:
a) x2 – 4 – (x + 2)2 | b) (x + 2)(x – 2) – (x – 3)(x + 1) |
c) (x – 2)(x + 2) – (x – 2)(x + 5) | d) (6x + 1)2 + (6x – 1)2 – 2(6x + 1)(6x – 1) |
e) 7a(3a – 5) + (2a -3)(4a + 1) – (6a – 2)2 | g) (5y – 3)(5y + 3) – (5y – 4)2 |
h) (3x + 1)3 – (1 – 2x)3 | i) (2x + 1)2 + 2(4x2 – 1) + (2x – 1)2 |
a: Ta có: \(x^2-4-\left(x+2\right)^2\)
\(=x^2-4-x^2-4x-4\)
=-4x-8
b: Ta có: \(\left(x+2\right)\left(x-2\right)-\left(x-3\right)\left(x+1\right)\)
\(=x^2-4-x^2+2x+3\)
=2x-1
c: ta có: \(\left(x-2\right)\left(x+2\right)-\left(x-2\right)\left(x+5\right)\)
\(=\left(x-2\right)\left(x+2-x-5\right)\)
\(=-3x+6\)
d: Ta có: \(\left(6x+1\right)^2-2\left(6x+1\right)\left(6x-1\right)+\left(6x-1\right)^2\)
\(=\left(6x+1-6x+1\right)^2\)
=4
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e: ta có: \(7a\left(3a-5\right)+\left(2a-3\right)\left(4a+1\right)-\left(6a-2\right)^2\)
\(=21a^2-35a+8a^2+2a-12a-3-\left(36a^2-24a+4\right)\)
\(=29a^2-45a-3-36a^2+24a-4\)
\(=-7a^2-21a-7\)
g: ta có: \(\left(5y-3\right)\left(5y+3\right)-\left(5y-4\right)^2\)
\(=25y^2-9-25y^2+40y-16\)
=40y-25
h: Ta có: \(\left(3x+1\right)^3-\left(1-2x\right)^3\)
\(=27x^3+27x^2+9x+1-1+6x-12x^2+8x^3\)
\(=35x^3+15x^2+15x\)
i: Ta có: \(\left(2x+1\right)^2+2\left(4x^2-1\right)+\left(2x-1\right)^2\)
\(=\left(2x+1+2x-1\right)^2\)
\(=16x^2\)
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cho 2 đa thức
A(x) = 1/3(x^3-6x^4+3x^2-1) + 2(x^2-x^5+x)
B(x) = x^6-4x^5+2x^2+x^3+2/3
a, tính a(x)+b(x), 2a(x)-b(x), 3a(x)-6b(x)
b, tính a(4), a(-1), b(2), a(-1)-2b(1)
Rút gọn biểu thức:
a) (2x+5)2+(2x-5)2-(2x-1)(2x+1)
b) (2a+b)3+(2a-b)3-16a3
c) (2x-1)3-(x-2)(x2+2x+4)-7x3-2x
d) (x+1)2-(x-1)2-3(x+1)(x-1)
e) (x2+2)2-(x-2)(x+2)(x2+4)
a: \(=4x^2+20x+25+4x^2-20x+25-\left(4x^2-1\right)\)
\(=8x^2+50-4x^2+1=4x^2+51\)
b: \(=8a^3+12a^2b+6ab^2+b^3+8a^3-12a^2b+6ab^2-b^3-16a^3\)
\(=12ab^2\)
c: \(\left(2x-1\right)^3-\left(x-2\right)\left(x^2+2x+4\right)-7x^3-2x\)
\(=\left(2x-1\right)^3-x^3+8-7x^3-2x\)
\(=8x^3-12x^2+6x-1-8x^3-2x+8\)
\(=-12x^2+4x+7\)
d: \(\left(x+1\right)^2-\left(x-1\right)^2-3\left(x+1\right)\left(x-1\right)\)
\(=x^2+2x+1-\left(x^2-2x+1\right)-3\left(x^2-1\right)\)
\(=x^2+2x+1-x^2+2x-1-3x^2+3\)
\(=-3x^2+4x+3\)
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a. (2x - 3)3 - (3x - 2).(3x + 2)b. (4x + 3)3 - (5x + 1).(1 -5x)c. (5x - 2)3 - (x2 - 1) . (x2 +1)d. (3a - 2)3 - (4a + 1).(1 - 4a)e. (5a - 3).(5a +3) - (2a -1)3f. (9a - 2).(9a + 2) - (3a +1)3g. (3x + 5)3 - (8x -3).(8x +3)h.(x +2)3 - 6 (x +2)2 + 12.(x + 2) - 8i. (2x - 3)2 - 6 (2x - 3) + 9k. (3x - 2017)3 + 3.(3x - 2017)2 + 3.(3x - 2017) + 1giải giúp mk nha thks cần gấp sắp đi họk rồj HELP ME :(
Đọc tiếp
a. (2x - 3)3 - (3x - 2).(3x + 2)
b. (4x + 3)3 - (5x + 1).(1 -5x)
c. (5x - 2)3 - (x2 - 1) . (x2 +1)
d. (3a - 2)3 - (4a + 1).(1 - 4a)
e. (5a - 3).(5a +3) - (2a -1)3
f. (9a - 2).(9a + 2) - (3a +1)3
g. (3x + 5)3 - (8x -3).(8x +3)
h.(x +2)3 - 6 (x +2)2 + 12.(x + 2) - 8
i. (2x - 3)2 - 6 (2x - 3) + 9
k. (3x - 2017)3 + 3.(3x - 2017)2 + 3.(3x - 2017) + 1
giải giúp mk nha thks cần gấp sắp đi họk rồj HELP ME :(
Rút gọn biểu thức dựa vào hàng đảng thức( 7 hàng đẳng thúc đáng nhớ)
a) A=(a+b)^2 - (a+ 2)(a - 2)
b) B=(1/2a + b)^3 + ( 1/2a - b)^3
c) C=( x-3)-(x+3)
d) D=(a=2)^3 - a.(a-3)^2
e) E=(2x-5)(2x+5)-(2x-3)^2-12x