Question

a) 1+3×[7+8×7-3+3×(5+6)] b) [55×5-(199-99×2+20×5)+220:10]:4 c)5+[7+3×(7-2)] :2-6 d) 9+8×[7+6×(5+4×3)-2×1]-10×10

Answer 1

A) 1+3×[7+8×7-3+3×(5+6)] 1. ) 5+6 = 11
2) 8x7=56
3)3x11=33
4)7+56 =63
5)63-3=60
6) 60+ 33= 93
7)3 x 93 =279
8)1 +279 = 230 

Answer 2

a) 1+3 x [7+8 x 7-3+3x(5+6)] =
= 1+3 x [7+ 8 x 7-3+3 x 11]=
= 1+3 x [ 7+56- 3 + 33]=
= 1+3 x [ 63- 36]=
= 1+3 x 27=
= 1+ 81=
= 82 
 

b) [ 55 x 5-(199- 99 x 2 + 20 x 5) + 220:10]:4=
=[ 55x5-(199- 198+100) + 220:10]:4=
=[55x5- 101 + 220:10]:4=
= [ 275-101+ 22] :4=
=[ 174 + 22] :4=
= 196:4=
= 49
c) 5+[7+3x(7-2)]:2-6=
= 5+ [7+3x5]:2-6=
= 5+[ 7+ 15]:2-6=
= 5+ 22: 2-6=
= 5+ 11 - 6=
= 16-6=
= 10 

d) 9+8x[7+6x(5+4x3)- 2x1]-10x10=
= 9+8x[ 7+6x( 5+ 12)- 2x1]- 10x10=
= 9+8x[ 7+6x17-2x1]- 10x10=
= 9+8x[7+ 102-2] - 10x10=
= 9+8x[ 109-2]-10x10=
= 9+8x107-10x10=
= 9+ 856- 100=
= 865-100=
= 765
 
sper ca te-am ajutat!! 
semnul inmultirii , adica ori l-am notat cu " x" pt. ca nu am avut semnul pe tastatura! sper sa intelegi!!