已知:a(a-1)-(a2-b)=-5.求:代数式a2+b22-ab的值.
已知:a(a-1)-(a
2-b)=-5.求:代数式
-ab的值.
数学人气:151 ℃时间:2019-10-23 02:10:03
优质解答
∵a(a-1)-(a
2-b)=-5,
∴a
2-a-a
2+b=-5,
∴b-a=-5,
∴
-ab
=
=
=
=
.
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