If a 15, b 7, and a b a b, find the value of a b

Solution: Because |a|=15,|b|=7, then a = 15, b = 7 and because of |a+b|=a+b, then a+b>0;

Then a>0, a=15

So: when b>0, a-b=15-7=8;

When b<0, a-b=15-(-7)=15+7=22

Because |a+b|=a+b

So a+b>0

So a = 15, b = -7 or 7

So a-b = 15-7 = 8

or 15 + 7 = 22

Cover |a|=5，|b|=7, a=5 or -5, b=7 or -7, and |a+b|=a+b,a+b 0,a=5 or -5,b=7,a-b=5-7=-2, or a-b=-5-7=-12

Therefore, the answer is: -2 or -12

Solution: By the title a b a (a b) scum sun or a b a b

Kedejia Meng 2a 2b 0 is a b 0

Therefore, when A 5 and B a 7, A A 5 and such as a spike chain B a 7 can be satisfied.

Please be quick: 丨a-b丨=-(a-b) Explain that a-b<0 is a

|a|=5, then his absolute value has 5 and -5, |b|=7, then his absolute value is 7, -7, |a+b|It can only be 7+5=12, and if they are equal to -(a+b), they can only make a and b negative numbers and conclude that negative and negative are positivea-b is -5-(-7)=2.Be sure to adopt !!

If |a|=5，|b|=7

then a = 5 and b = 7

Because |a+b|=-（a+b）

So a+b>0

Then a=-5, b=-7 or a=5, b=-7

So the values of a-b are 2 or 12

丨a+b丨=-(a+b).

Explain that a+b is a negative number.

丨a丨=5, 丨b丨=7

a=5,b=-7

or a = -5, b = -7

A-B12 or 2

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If |a|=5,|b|=7, and |a+b|= - a+b) then a+b<0

then a=5, b=-7 or a=-5, b=-7

So a-b = 12 or 2

2 or 12 Because a+b is negative, so: a=5 b=-7 or a=-5 b=-7

∵|a|=5，|b|=7, a=5 or -5, b=7 or -7, and |a+b|=a+b,a+b 0,a=5 or -5,b=7,a-b=5-7=-2, or a-b=-5-7=-12

So the answer is: -2 or -12