Question

Calculati:
[450:5:(3*6)+35]*7-140+(540:60+7)*(63:9)
[500-(3500:700*80-40*9)*(64:8)]:9-(72:6):(81:27)
2*{350:[491-3*(125-78)]+350}

Answer 1

[450:5:(3*6)+35]*7-140+(540:60+7)*(63:9)=(90:18+35)*7-140+(9+7)*7=
=(5+35)*7-140+16*7=40*7-20*7+16*7=7*(40-20+16)=7*36=252

[500-(3500:700*80-40*9)*(64:8)]:9-(72:6):(81:27)=[500-(5*80-40*9)*8]: 9-12:3=[500-(5*2*40-40*9)*8]: 9-4=(500-40*8): 9-4=(500-320): 9-4=
=180:9-4=20-4=16

2*{350:[491-3*(125-78)]+350}=2*[350:(491-3*47)+350]=2*[350: (491-141)+350]=2*(350: 350+350)=2*(1+350)=2*351=702