3x²+2x-5=3
3x²+2x=8
9-4x-6x²=9-2﹙2x+3x²﹚=9-2×8=-7
已知3x的2次幂+2x-5=3,则9-4x-6x的2次幂的值是
已知3x的2次幂+2x-5=3,则9-4x-6x的2次幂的值是
数学人气:259 ℃时间:2019-11-09 19:39:56
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