30) а) (143,65 − 40,7) : 2,9 − 17,75; б) 8,74 : (2,43 + 2,17) − 0,475; в) (21,2544 : 0,9 + 1,02 − 3,2) : 5,6; г) 4,36 : (3,15 + 2,3) + 0,792 − 0,78; д) (3,91 : 2,3 · 5,4 − 4,03) · 2,4; е) 6,93 : (0,028 + 0,36 · 4,2) − 3,5.

Question

Вопрос:

Accepted Answer

а) \((143.65-40.7):2.9-17.75=102.95:2.9-17.75=35.5-17.75=17.75\).

б) \(8.74:(2.43+2.17)-0.475=8.74:4.6-0.475=1.9-0.475=1.425\).

в) \((21.2544:0.9+1.02-3.2):5.6=(23.616+1.02-3.2):5.6=21.436:5.6=3.827857\ldots\).

г) \(4.36:(3.15+2.3)+0.792-0.78=4.36:5.45+0.012=0.8+0.012=0.812\).

д) \((3.91:2.3\cdot5.4-4.03)\cdot2.4=(1.7\cdot5.4-4.03)\cdot2.4=(9.18-4.03)\cdot2.4=12.36\).

е) \(6.93:(0.028+0.36\cdot4.2)-3.5=6.93:(0.028+1.512)-3.5=6.93:1.54-3.5=4.5-3.5=1\).

Ответ: 17,75; 1,425; 3,827857…; 0,812; 12,36; 1.