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> 计算或解方程(1)48+12-33;(2)x2+4x-5=0.-数学
计算或解方程(1)48+12-33;(2)x2+4x-5=0.-数学
题目简介
计算或解方程(1)48+12-33;(2)x2+4x-5=0.-数学
题目详情
计算或解方程
(1)
48
+
12
-3
3
;
(2)x
2
+4x-5=0.
题型:解答题
难度:中档
来源:不详
答案
(1)原式=4
3
+2
3
-3
3
=3
3
;
(2)∵x2+4x-5=0,
∴(x+5)(x-1)=0,
∴x+5=0或x-1=0,
解得:x1=-5,x2=1.
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题目简介
计算或解方程(1)48+12-33;(2)x2+4x-5=0.-数学
题目详情
(1)
(2)x2+4x-5=0.
答案
=3
(2)∵x2+4x-5=0,
∴(x+5)(x-1)=0,
∴x+5=0或x-1=0,
解得:x1=-5,x2=1.