已知x-2和-6互为相反数,求x的平方+2x-1的值? 已知a与b互为相反数.求-2a-2-2b的值?
已知x-2和-6互为相反数,求x的平方+2x-1的值? 已知a与b互为相反数.求-2a-2-2b的值?
数学人气：788 ℃时间：2019-10-26 10:51:32
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您好： x-2和-6互为相反数x-2-6=0x=8x²+2x-1=8²+2x8-1=64+16-1=79 a与b互为相反数a+b=0-2a-2-2b=-2(a+b)-2=-2x0-2=-2 如果本题有什么不明白可以追问,如果满意请点击“选为满意答案”如果有其他问题请采...
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