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> 计算(1)-3+-(-)=(2)一个正数a的平方根是m+1和3m-5,求a。-七年级数学
计算(1)-3+-(-)=(2)一个正数a的平方根是m+1和3m-5,求a。-七年级数学
题目简介
计算(1)-3+-(-)=(2)一个正数a的平方根是m+1和3m-5,求a。-七年级数学
题目详情
计算
(1)
-3
+
-(-
)=
(2)一个正数a的平方根是m+1和3m-5,求a。
题型:计算题
难度:中档
来源:江苏期末题
答案
(1)解: 原式=4-1+0.5×0.8+2
=5.4
(2)解:由题意得:(m+1)+(3m-5)=0
解之得: m=1
∴m+1=2 即 正数a的平方根是2
∴a=4
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题目简介
计算(1)-3+-(-)=(2)一个正数a的平方根是m+1和3m-5,求a。-七年级数学
题目详情
(1)
(2)一个正数a的平方根是m+1和3m-5,求a。
答案
=5.4
(2)解:由题意得:(m+1)+(3m-5)=0
解之得: m=1
∴m+1=2 即 正数a的平方根是2
∴a=4