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数学
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现规定一种运算a※b=ab+a-b,其中a,b为实数,则a※b+(b-a)※b等于( )
A. a
2
-b
B. b
2
-b
C. b
2
D. b
2
-a
人气:311 ℃ 时间:2019-11-05 21:13:39
解答
a※b+(b-a)※b,
=ab+a-b+(b-a)×b+(b-a)-b,
=ab+a-b+b
2
-ab+b-a-b,
=b
2
-b.
故选B.
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