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数学
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已知x的2次方+2y+z-1=4,求2x的2次方+4y+2z-15
人气:330 ℃ 时间:2020-02-02 06:30:53
解答
x的2次方+2y+z-1=4,
∴x²+2y+z=5
∴2x²+4y+2z-15
=2(x²+2y+z)-15
=2×5-15
=-5能再明白点吗??不太懂x²+2y+z作为整体,用5代替
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