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> 计算:27-3=______,方程x2=2x的根是______.-数学
计算:27-3=______,方程x2=2x的根是______.-数学
题目简介
计算:27-3=______,方程x2=2x的根是______.-数学
题目详情
计算:
27
-
3
=______,方程x
2
=2x的根是 ______.
题型:填空题
难度:中档
来源:不详
答案
27
-
3
=3
3
-
3
=(3-1)
3
=2
3
;
将方程x2=2x变形,
x2-2x=0,
∴x(x-2)=0,
∴x=0或x-2=0,
∴x1=0,x2=2.
故答案为:2
3
;x1=0,x2=2.
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题目简介
计算:27-3=______,方程x2=2x的根是______.-数学
题目详情
答案
将方程x2=2x变形,
x2-2x=0,
∴x(x-2)=0,
∴x=0或x-2=0,
∴x1=0,x2=2.
故答案为:2