(3)125-8x³=0(4)x²+1=1.01

问题描述:

(3)125-8x³=0(4)x²+1=1.01

(3)125-8x³=0125 = 8x³ (2x)³ = 5³2x = 5 x = 2.5 (4)x²+1=1.01x² = 1.01 - 1x² = 0.01x1 = 0.1 x2 = -0.1