Question

Ma ajutati va rog urgent

Answer 1

a) (77×4-77-77:77-77) -77×77=

=(308-77-1-77)-77×77=

=(231-1-77)-77×77=

=(230-77)-77×77=

=153-77×77=

=153-5929=

=5929-153=

=5776

b)27:[26+(6×5-7×a):5=1

27:[26+(30-7×a):5=1

26+(30-7×a):5=27×1=27

30-7×a:5=27-26=1

30-7×a=1×5=5

7×a=30+5=35

35:7=5

a=5

c) 1000-[5+2×(100+y×4) -124:4]=154

5+2×(100+y×4) -124:4=1154

2×(100+y×4) -124:4=1149

2×(100+y×4)-124=4596

2×(100+y×4)=4472

100+y×4=2236

100+y=559

559-100=

459