Question

2015 +100: 4 x 75- 123: 1=?????
5x ( 50x20-12x56) - 800x2=??
150x(1015-975) -(975-88: 8) =???

Answer 1

2015+100:4×75-123:1=
2015+25×75-123=
2015+1875-123=
3890-123=3767


5×(50×20-12×56)-800×2=
5×(1000-672)-1600
5×328-1600=
1640-1600=40


150×(1015-975)-(975-88:8)=
150×40-(975-11)=
6000-964=5036

Answer 2

2015 + 100 : 4 x 75 - 123 : 1= 3 767
= 2015 + 25 x 75 - 123 = 
= 2015 + 1 875 - 123 =
= 3 890 - 123 =
= 3 767 


5 x ( 50 x 20 - 12 x 56) - 800 x 2 = 40
= 5 x ( 1 000 - 672 ) - 1 600 =
= 5 x 328 - 1 600 =
= 1 640 - 1 600 =
= 40  



150 x (1 015 - 975) - (975 - 88 : 8) = 5 036 
= 150 x 40 - ( 975 - 11) =
=  6 000 - 964 =
=  5 036