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y=-x2+5x y=-x2+10x y=x2+5x y=x2+10x
2x-4-12x+3=9,-10x=9-4+3,故x=0.8 ; 2x-4-12x+3=9,-10x=9+4-3,故x=-1 ; 2x-4-12x-3=9,-10x=9+4+3,故x=-1.6; 2x-2-12x+1=9,-10x=9+2-1,故x=-1 ;
y = 20ax 5x y = 25ax 5x y = 90ax 10x y = 100ax 10x
y=-10x2-560x+7 350 y=-10x2+560x-7 350 y=-10x2+350x y=-10x2+350x-7 350
5x 8x 10x 10x 15x 10x 20x 45x
5x+2=7x-8 5x-2=7x+8 5x+2=7x+8 5x-2=7x-8
8x﹣2=10x+6 8x+2=10x﹣6 8x﹣2=10x﹣6 8x+2=10x+6
2x+1﹣(10x+1)=1 4x+1﹣10x+1=6 4x+2﹣10x﹣1=6 2(2x+1)﹣(10x+1)=1
I=4x=5 I=7x=15 I=6x=8 I=10x=7