If A-B = 5, then 3A + 7 + 5b-6 (a + 13b)=______ ．

If A-B = 5, then 3A + 7 + 5b-6 (a + 13b)=______ ．

3A + 7 + 5b-6 (a + 13b), = 3A + 7 + 5b-6a-2b, = - 3A + 3B + 7, = - 3 (a-b) + 7, = - 3 × 5 + 7, = - 8

x=3a+5b=7*(5b-a)+10*(a-3b)
How did it come about,

Let 3A + 5B = P (5b-a) + Q (a-3b)
Right = 5pb PA + qa-3qb
=(q-p)a+(5p-3q)b
=3a+5b
So Q-P = 3
5p-3q=5
So p = 7, q = 10
So 3A + 5B = 7 * (5b-a) + 10 * (a-3b)

First simplify, then evaluate: (a-3b) (3a + b) - (a + 5b) (a-5b), where a = - 8, B = - 6

The original formula = (3a & # 178; + ab-9ab-3b & # 178;) - (A & # 178; - 25B & # 178;) = 3A & # 178; - 8ab-3b & # 178; - A & # 178; + 25B & # 178; = 2A & # 178; - 8ab + 22b & # 178; = 2 * (- 8) & # 178; - 8 * (- 8) * - 6) + 22 * (- 6) & # 178; = 536

Given A-B = 5, simplify 3a-3b

3a-3b
=3*（a-b）
=3*5
=15

If 2 (a-b) = 6, then 3b-3a = ()

It is known that 2 (a-b) = 6
[multiply by - 3 / 2]
3b-3a=(-9)

If a "fill in the blanks (1) a + 1 () B + 1 (2) a-5 () B-5 (3) - 3A () - 3B (4) 6-A () 6-b

(1)a+1()6-b

If 2A + 3B = 4 and 3a-b = - 5 hold at the same time, then a = 1__ b=___
Are they - 1 and 2

If 2A + 3B = 4 and 3a-b = - 5 hold simultaneously, then a = 1_ -1_ b=_ 2_
Yes, the answer is correct

(2a + b) (2a-3b) - 3A (2a + b) emergency

（2a＋b）（2a-3b）-3a（2a＋b）
=(2a + b) [(2a-3b) - 3A] to extract a common factor
=（2a＋b）（-a-3b）
=-(2a + b) (a + 3b) decomposes the factor
=-2A ^ 2-7ab-3b ^ 2 should be simplified to this step

2log (2) root 30 log (2) 3 log (2) 5 evaluation

2log (2) radical 30 log (2) 3 log (2) 5
=log₂(√30)²-log₂(3×5)
=log₂30-log₂15
=log₂(30/15)
=log₂2
=1

Calculation: - x ^ N Y ^ n + 1 * (x ^ 3Y ^ 2n) 2=________ . calculation: (2a ^ 3B ^ 4) 3 + (- 3A ^ 3B ^ 4) 3 + (- A ^ 3B ^ 4) 3=_______________ .
The result of formula 2XY (- 2x ^ 2Y ^ 2) * (- 3x ^ 3Y) is__________ .

Calculation: - x ^ N Y ^ n + 1 * (x ^ 3NY ^ 2n) 2=_ x^ny^n(x^5ny^3n-1);_______ .
Calculation: (2a ^ 3B ^ 4) 3 + (- 3A ^ 3B ^ 4) 3 + (- A ^ 3B ^ 4) 3
=8a^9b^12-27a^9b^12-a^9b^12
=-20a^9b^12;
The result of formula 2XY (- 2x ^ 2Y ^ 2) * (- 3x ^ 3Y) is___ 12x^6y^4;_______ .
=12x^6y^4;
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