若式子3x²-4x+6的值是9,求x²-3分之4x+16的值,
人气:362 ℃ 时间:2019-11-10 08:34:18
解答
3x²-4x+6的值是9
3x²-4x=9-6=3
x²-3分之4x+16
=3分之1 (3x²-4x)+16
=3分之1×3+16
=1+16
=17
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