启东中学数学作业本七上答案16页，已知：|a|=4，|b|=2,且a>b，求a+b的值
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(1）a=4，b=-2a+b=2
(2)a=4 b=2
a+b=6
当a为4，b为2时等于6 当a为四b为-2时等于2
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绛旓細=锛1/1+1/2+鈥︹+1/9锛-锛2/1+2/2+鈥︹2/8锛+鈥︹+锛7/1+7/2+7/3锛-锛8/1+8/2锛+7/1 =45-18+鈥︹+7/6-8/3+7/1 =27+鈥︹+7/6-8/3+7/1 =54/1787
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