Question

Раскройте скобки и упростите выражения:
а)23,6+(14,5-30-1)-(6,8+1,9)
б)20,9-2(14,8+17,9)-(6,6-15,7)

Answer 1

1) 23.6+(14.5-30.1)-(6.8+1.9)=23.6-15.6-8.7=8-8.7=-0.7

20.9-(14.8+17.9)-(6.6-15.7)=20.9-32.7+9.1=20.9-41.8=-20.9

2) х-0.2у-0.7х+10+0.5у-0.3-18=0.3х+0.3у-8.3=0.3*100.1+0.3*(-30)-8.3=30.03-90-8.3=-68.27