20+20(x+1)+20(x+1)²=95.
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20+20(x+1)+20(x+1)²=95.
20+20(x+1)+20(x+1)²=95.20+20(x+1)+20(x+1)²=95.
20+20(x+1)+20(x+1)²=95
1+(x+1)(x+1)²=4.75
x²+3x-1.75=0
(x+3.5)(x-0.5)=0
x=-3.5 x=0.5方程化简;4x^2+12x-7=0
(2x-1)(2x+7)=0;
x1=1/2,x2=-7/24(x+1)^2+4(x+1)-15=0 ---- (2(x+1)+5)*(2(x+1)-3)=0 --- 2(x+1)+5=0 得x=-7/2
2(x+1)-3=0 得x=1/2两边都除以20就可以得到(x+1)²+(x+1)+1=4.75 化简x²+2x+1+x+1+1=4.75
得到x²+3x-1.75=0 (x+3.5)(x-0.5)=0 x=-3.5 x=0.520+20(x+1)+20(x+1)²=95
1+(x+1)(x+1)²=4.75
x²+3x-1.75=0
(x+3.5)(x-0.5)=0
x=-3.5 x=0.5