For math masters, please enter the integer addition and subtraction questions

Solution: a*b+(b-a)*b=ab+a-b+(b-a)b+b-a-b

ab+a-b+b^2-ab-a

B 2-B I'm a math know-it-all, I can't figure out math problems, hurry up and get on math know-it-all!

Because a times b ab + a-b, a times b(b-a) times b {ab(b-a)+a-b(b-a)}*b+ab(b-a)+a-b(b-a)+b(b-a)+b answer supplement.

Solution: The original formula ab a b (b b ab a ab a b) ab a b should be subtracted b from the last b squared, but I won't square b so that's it.

Simple Yes: ab+a-b+(b-a)b+(b-a)-b=ab+a-b+(b-squared)-ab+b-a-b=b-squared-2b

Let's figure it out for ourselves.

Let x be the first milestone tens, and y be the first milestone units.

10y+x)-(10x+y)=(100x+y)-(10y+x)9y-9x=99x-9y

18y=108x

y=6xx, where y is the number between 1 and 9.

Only x=1, y=6

Answer: These three numbers are:

The answer has been sent Attention checks.

Solution: a=a -2a b+ab ,b=3a b+2ab -a ,a 2b c

c=a-2b

a³-2a²b+ab²-2（3a²b+2ab²-a²）=a³-2a²b+ab²-6a²b-4ab²+2a²=a³-8a²b-3ab²+2a²

9x -(4x +x-3) 5x 6x 1 5x=9x -4x -x+3 5x +6x-1-5x=(9x -4x 5x)+6x-x-5x)+(3-1)=2Since there is no x term after the original simplification, the answer has nothing to do with how much x is equal to, so his result is still correct.

Original = 3x y - (2xy -2xy + 3x y + xy )+3xy = 3x y-2xy +2xy-3x y-xy +3xy = (3x y-3x y) + (3xy -2xy -xy )+2xy = 2xy

Substituting x=3, y=-1 3 into it.

Original = 2 3 (-1 3) = -2

May it help you!

Because the result of the calculation has nothing to do with x.

Question! Let's put 。。 Don't abuse me ... Let's start with the simple ones.

If I'm not mistaken, the correct answer is -5

Then the wrong answer is 12 between 7 and -5

That is to say, the 6x 5 symbol was read wrong.

-10+9-8+7-6+5-4+3-2+1=-5-10+9-8+7+6+5-4+3-2+1=76x 5 is wrong.

If I'm not mistaken, the correct answer is -5

Then the wrong answer is 12 between 7 and -5

That is to say, the 6x 5 symbol was read wrong.

The boy in the middle is 85, 5=17, and 13, 15, 17, 19, 21

The girl in the middle is 80, 5=16, and 12, 14, 16, 18, 20

The principle is that more supplies are less, and 5 people are exactly averaged, so divide by 5 to get the middle number.