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在等式“2×()-3×()=15”的括号中分别填入一个数,使这两个数满足互为相反数.
在等式“2×()-3×()=15”的括号中分别填入一个数,使这两个数满足互为相反数.
发布时间:2020-08-04 21:14:57
在等式“2×( )-3×( )=15”的括号中分别填入一个数,使这两个数满足互为相反数.
网友回答
3和-3解析本题考查的是相反数的定义、一元一次方程的应用
设第一个括号中填a,则第二个括号中填-a,即可得到方程,解出即得结果。
2a-(-3a)=15
解得a=3
则这两个数为3和-3.
思路拓展:本题利用所填的两数互为相反数这一关系,把问题转化为方程问题解决.
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设集合A与B的一种运算*为:A*B={x︱x=ab,a∈A,b∈B}.若A={1,2},B={0,2},求A*B中的所有元素
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