已知|m+n-2|+(mn+3)²=0 求3(m+n)-2[mn+(m+n)]-3[2(m+n)-3mn]的值
人气:118 ℃ 时间:2020-03-29 19:00:28
解答
依题意得:
m+n-2=0
mn+3=0
得:m+n=2,mn=-3,
原式=3×2-2[2+(-3)]-3[2×(-3)-3×2]
=6+2+36
=44.
推荐
猜你喜欢
- Helen's parents working in China,her father is a teacher and her mother is a lawyer,Helen was born in the United States.
- 在三棱锥P-ABC中,面PAB垂直于面ABC,AB垂直于BC,AP垂直于PB,求证面PAC垂直于面PBC
- 用禁锢 器宇 鹤立鸡群 颔首低眉写一句话,不要“在封建文化的禁锢之下,黄宗羲器宇轩昂,在一众只肯埋首故
- He always gets to school—than his deskmate Bill.
- 某种细菌每经过20分钟便由1个分裂成2个,那么经过2小时后细菌有1个分裂成?个
- Sio2与C反应式?
- sin5π和cos5π等于多少
- 有甲乙两桶水,甲是乙的5倍,如果甲给乙倒入20千克后,两桶相等,甲乙两桶原来各有多少水?