25/8
因为 2y²+3=7y 所以 2y²-7y =—3=
2(y-7/4)²=2(y²-7y/2+49/16)=2y²-7y +49/8
=—3+49/8
=25/8
方程2y²+3=7y配方后,得2(y-7/4)²=____.
方程2y²+3=7y配方后,得2(y-7/4)²=____.
数学人气:593 ℃时间:2019-09-27 06:52:08
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