First factorize, then evaluate 3A (2a & sup2; - 4A + 3) - 2A & sup2; (3a + 4), where a = - 2
=a[6a²-12a+9-(6a²+8a)]
=a(9-20a)
=-2(9+40)
=-98
RELATED INFORMATIONS
- 1. The problem of merging similar items in grade one of junior high school, Remove the brackets and merge the same items x+(2x-1)-(x/3+3) 1 / 2 (square of X-Y) + 1 / 3 (square of X-Y) + 1 / 6 (square of X + square of Y)
- 2. Ask a few exercises about removing brackets and merging similar items in mathematics of grade one in junior high school~ Must copy the original title, talented prawns help me acridine 1: Remove the brackets and merge the similar items: (1)a+(-b+c-d)(2)a-(-b=c-d)(3)-(p+q)+(m-n) (4)(r+s)-(p-q)(5)3(2xy-y)-2xy(6)a+(5a-3b)-(a-2b) (7)x+[x+(-2x-4y)](8)1/2(a+4b)-1/3(3a-6b)(9)a+(2a-3c) (10)6x+2(x+3)(11)3x-(4y-2x)+y(12)(2x-2y)-(2y-3x) (13)(x-y)-2(x-3x-2y) 2: According to the rule of removing brackets, the__ Fill in "+" or "-" (1)a __ (-b-c)=a-b+c (2)a __ (b-c-d)=a-b+c+d (3)__ (a-b)__ (c+d)=c+d-a+b 3: Mr. Zhang asked the students to calculate "the value of the algebraic formula A & sup2; + a (a + b) - 2A & sup2; - 2b when a = 0.25 and B = - 0.37." Xiao Ming said that the result can be obtained without any conditions. Do you think what he said is reasonable? Give the reasons 4: First simplify, then find the value of the algebraic formula: (3a-5b) - 2 (3a-b), where a = - 2, B = 3
- 3. The problem of combining similar items and removing brackets in mathematics of grade one in junior high school Known: | x-y-3 | + (a + B + 4) 178; = 0, find [(X-Y) 178; - 3 (Y-X)] / [2A + 2B - (a + b)]
- 4. How to combine the similar items in the first grade of junior high school 1. When m = (), the algebraic expression 2x & sup2; - MXY + & frac34; X contains no XY term 2. The taxi charge standard of a city is: the starting price is 4 yuan, and the price per kilometer after 2 kilometers is 1.2 yuan. How much yuan should Zhang Liang pay for a kilometer? (expressed in algebraic formula) 3. Dividing by a number that is not zero is equal to multiplying by the reciprocal of the number? I'm a student of grade one in junior high school. I'm very dizzy about the merging of similar items in mathematics
- 5. Several problems of merging similar items in grade one of junior high school ①n-{n-2+[5m-3(n+2m)+6n]}+2n ②½x-2(x-1/3y²)+(-3/2x+1/3y²) ③2(t²-t-1)-(t²-t-1)+3(t²-t-1) ④-5(2m-n)-6(2n-3m) ⑤-3(ab-5b²+2a²)-3(7ab+1ba²-25b²)
- 6. 20 exercises of merging similar items of rational numbers
- 7. If the side length of the triangle ABC is a, B, C, the square of a + the square of B + the square of C + 338 = 10A + 24B + 26c, try to judge the shape of the triangle
- 8. The number whose absolute value is greater than 2 / 3 and less than 8 / 3 is ()
- 9. (1) If - a = - 4, then a =?; if the opposite number of - A is - 6, then a =? (2) how many negative integers have absolute values greater than 2.5 and less than 7.2? (3) If | M-1 | = M-1, then M is greater than or less than or equal to 1 (4) If 2 < a < 4, then | 2-A | + | A-4 | = what (5) Given that | a | = 2, | B | = 3, and B < A, then A-B = what
- 10. one Scientific experiments show that the charge of the nucleus and electron in the atom are two opposite charges. Physics stipulates that the charge of the nucleus is positive, and the charge of the nucleus and electron in the hydrogen atom is one charge each. The charge they carry is expressed by positive and negative numbers. I know about positive and negative numbers, but I don't know about nucleus, electron and charge
- 11. 3x & sup3; + 2x-5,4x & sup2; - 4x-1, a & sup3; - 3A & sup2; B + 3AB & sup2; - B & sup3;, factorization,
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- 13. Factorization: A & sup2; + 2Ab + B & sup2; - 3a-3b-4
- 14. Factorization: A & sup2; - 2Ab + B & sup2; - 3A + 3b-10
- 15. Factorization A & sup2; - 2Ab + B & sup2; - 3A + 3b-4
- 16. 2(2a²+9b)+3(-5a²-4b)
- 17. Given | 2a-c + & frac14;; (4b-5a) & sup2;; = 0, find a: B: C
- 18. 2006 and 2007 divide 2006 by 2006 in a simple way
- 19. How to write the formula of 2008 times 2007 of 2009 There are also 4 △ 132 + 6 × 53 (0.86 + 0.86 + 0.86 + 0.86) × 25 261-2.86 × (6.25-641) 261-2.86×(6.25-641) 7.6×21÷[1.9-1.9×(1.9-1.9)] (70+681)×691 1-1÷2-1÷3-61 19.98×37-199.8×1.9+1998×0.82
- 20. 2007 in addition to 2007 and 2008 in 2007 multiplied by 2009 + 2008 in 1