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> (1)计算:;(2)解方程组:;(3)求下列式中的x值:27x3﹣512=0.-八年级数学
(1)计算:;(2)解方程组:;(3)求下列式中的x值:27x3﹣512=0.-八年级数学
题目简介
(1)计算:;(2)解方程组:;(3)求下列式中的x值:27x3﹣512=0.-八年级数学
题目详情
(1)计算:
;
(2)解方程组:
;
(3)求下列式中的x值:27x
3
﹣512=0.
题型:计算题
难度:中档
来源:山东省期末题
答案
解:(1)
=4
﹣
+
=
;
(2)解方程组:
①×2-②得:5x=-21,x=﹣
,
把它代入②得:y=
,
∴
(3)27x3﹣512=0,
x3=
,
x=
。
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题目简介
(1)计算:;(2)解方程组:;(3)求下列式中的x值:27x3﹣512=0.-八年级数学
题目详情
(2)解方程组:
(3)求下列式中的x值:27x3﹣512=0.
答案
=4
=
(2)解方程组:
①×2-②得:5x=-21,x=﹣
把它代入②得:y=
∴
(3)27x3﹣512=0,
x3=
x=