计算或化简:(1)3(2)(3)()2(4)()(2)(5)(6)-八年级数学
解:(1)3=6﹣20=﹣14;(2)=3﹣+2=;(3)()2=2+2+5=7+2;(4)()(2)=(2)2﹣(3)2=12﹣18=﹣6;(5)=﹣=2﹣=;(6)=+1=5+1=6.
题目简介
计算或化简:(1)3(2)(3)()2(4)()(2)(5)(6)-八年级数学
题目详情
(1)3
(2)
(3)(
(4)(
(5)
(6)
答案
解:(1)3![]()
﹣20![]()
;![]()
﹣
+2![]()
;
)2
+5
;
)(2
)
)2﹣(3
)2![]()
﹣![]()
![]()
;![]()
+1
=6
=﹣14
(2)
=3
=
(3)(
=2+2
=7+2
(4)(
=(2
=12﹣18
=﹣6;
(5)
=
=2﹣
=
(6)
=
=5+1
=6.