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> (1)计算:;(2)求式中的x:(x+1)2-4=0。-八年级数学
(1)计算:;(2)求式中的x:(x+1)2-4=0。-八年级数学
题目简介
(1)计算:;(2)求式中的x:(x+1)2-4=0。-八年级数学
题目详情
(1)计算:
;
(2)求式中的x:(x+1)
2
-4=0。
题型:计算题
难度:中档
来源:期末题
答案
解:(1)原式=4-2-5=-3;
(2)移项,得(x+1)2=4,
开方,得x+1=±2,
解得x=1或-3。
上一篇 :
计算:(1)=();(2)=()。-八年级数学
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下列计算中,正确的[]A.B.C.D.-
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题目简介
(1)计算:;(2)求式中的x:(x+1)2-4=0。-八年级数学
题目详情
(2)求式中的x:(x+1)2-4=0。
答案
(2)移项,得(x+1)2=4,
开方,得x+1=±2,
解得x=1或-3。