Question

решите пожалуйста 3 номер

Answer 1

1)14у*1.8 - 14у*0.3у + 21*1.8 - 21*0.3у =0

25.2у - 4.2у^2 + 37.8 - 6.3у=0

4.2у^2 - 18.9у - 37.8 = 0

14у^2 - 63у - 126 = 0

D = 3969 + 7056 = 11025 (105)

X1 = (63+105):28 = 6

X2 = (63-105):28 = -1.5