两个非负数的和为零只有这两个数都为零时才成立.
所以a=8 b=-12
-a+b+9=-11
已知-a+8的绝对值+负12-b的2次方=0,求-a+b+9
已知-a+8的绝对值+负12-b的2次方=0,求-a+b+9
数学人气:509 ℃时间:2019-10-20 20:02:04
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