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> 3a-22和2a-3都是m的平方根,求a和m的值.(1)当3a-22与2a-3相等时,求a和m的值.(2)当3a-22与2a-3互为相反数时,求a和m的值.(3)讨论总结:m的值为______.-数学
3a-22和2a-3都是m的平方根,求a和m的值.(1)当3a-22与2a-3相等时,求a和m的值.(2)当3a-22与2a-3互为相反数时,求a和m的值.(3)讨论总结:m的值为______.-数学
题目简介
3a-22和2a-3都是m的平方根,求a和m的值.(1)当3a-22与2a-3相等时,求a和m的值.(2)当3a-22与2a-3互为相反数时,求a和m的值.(3)讨论总结:m的值为______.-数学
题目详情
3a-22和2a-3都是m的平方根,求a和m的值.
(1)当3a-22与2a-3相等时,求a和m的值.
(2)当3a-22与2a-3互为相反数时,求a和m的值.
(3)讨论总结:m的值为______.
题型:解答题
难度:中档
来源:不详
答案
(1)由题意得,3a-22=2a-3,
解得:a=19,
则3a-22=3×19-22=35,2a-3=35,
故m=352=1225;
(2)3a-22+2a-3=0,
解得:a=5,
3a-22=3×5-22=-7,2a-3=2×5-3=7,
故m=(-7)2=72=49;
(3)综合(1)(2)可得:m的值为1225或49.
上一篇 :
如果a是2008的算术平方根,则200
下一篇 :
正数的平方根有两个,它们是互为
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题目简介
3a-22和2a-3都是m的平方根,求a和m的值.(1)当3a-22与2a-3相等时,求a和m的值.(2)当3a-22与2a-3互为相反数时,求a和m的值.(3)讨论总结:m的值为______.-数学
题目详情
(1)当3a-22与2a-3相等时,求a和m的值.
(2)当3a-22与2a-3互为相反数时,求a和m的值.
(3)讨论总结:m的值为______.
答案
解得:a=19,
则3a-22=3×19-22=35,2a-3=35,
故m=352=1225;
(2)3a-22+2a-3=0,
解得:a=5,
3a-22=3×5-22=-7,2a-3=2×5-3=7,
故m=(-7)2=72=49;
(3)综合(1)(2)可得:m的值为1225或49.