九年级下册北师大版数学书总复习26题如何解?
九年级下册北师大版数学书总复习26题如何解?
数学人气:933 ℃时间:2019-10-24 07:42:03
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P205(1)∵y=0.2x²+3.5的顶点坐标为(0,3.5) ∴最大高度为3.5m(2)令y=3.05,则有-0.2x²+3.5=3.05 解得x1=1.5,x2=-1.5(不合题意,舍去).令x=4-1.5=2.5,则有y=-0.2X(-2.5)&su...
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