(4x−3)×2x−(2x+1)(3x−2)×2x=8x2−6x−(6x2−4x+3x−2)×2x=8x2−6x−(12x3−8x2+6x2−4x)=8x2−6x−(12x3−2x2−4x)=8x2−6x−12x3+2x2+4x=−12x3+10x2−2x=−2x(6x2−5x+1)
при х=0,7
- 2 \times 0.7(6 \times {0.7}^{2} - 5 \times 0.7 + 1) = - 1.4(2.94 - 3.5 - 1) = - 1.4 \times 0.44 = - 0.616−2×0.7(6×0.72−5×0.7+1)=−1.4(2.94−3.5−1)=−1.4×0.44=−0.616
