已知|a|=2,|b|=5,1)求a+b 2）若a>b,求a+b的值,

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已知|a|=2,|b|=5,1)求a+b2）若a>b,求a+b的值,已知|a|=2,|b|=5,1)求a+b2）若a>b,求a+b的值,已知|a|=2,|b|=5,1)求a+b2）若a>b,求a+b的

已知|a|=2,|b|=5,1)求a+b 2）若a>b,求a+b的值,
已知|a|=2,|b|=5,1)求a+b 2）若a>b,求a+b的值,

已知|a|=2,|b|=5,1)求a+b 2）若a>b,求a+b的值,
|a | = 2 ==> a =2 , -2 |b| = 5 ==> b = 5 , -5 a + b = 2 + 5 = 7 or a + b = (-2) + (-5) = - 7 or a + b = (-2) + 5 = 3 or a + b = 2 + (-5) = -3 a > b a + b = (-2) + (-5) = -7 or a + b = 2 + (-5) = -3