Question

a) 8-7:{6-5:[4-3:(2-2:2)]}
b) {[(7*3-5)+2*6]:4+5}*10-[(4+3*3)*5-60]

Answer 1

a)8-7:{6-5:[4-3:(2-2:2)]}=
8-7:{6-5:[4-3:(2-1)]}=
8-7:[6-5(4-3:1)]=
8-7:[6-5:(4-3)]=
8-7:(6-5:1)=
8-7:1=
8-7=1

b){[(7x3-5)+2x6]:4+5}x10-[(4+3x3)x5-60)]}=
{[(21-5)+2x6]:4+5}x10-[(4+3x3)x5-60)]}=
[(16+12):4+5]x10-[(13x5-60)]=
(24:4+5)x10-(65-60)=
(6+5)x10-5=
11x10-5=105

Answer 2

$a)8-7:{6-5:[4-3:(2-2:2)]}=$
$8-7:{6-5:[4-3:(2-1)]}=$
$8-7:[6-5(4-3:1)]=$
$8-7:[6-5:(4-3)]=$
$8-7:(6-5:1)=$
$8-7:(6-5)$
$8-7:1=$
$8-7=1$

$b){[(7*3-5)+2*6]:4+5}*10-[(4+3*3)*5-60]=$
${[(21-5)+12]:4+5}*10-[(4+9)*5-60)]=$
$[(16+12):4+5]*10-[(13*5-60)]=$
$(24:4+5)*10-(65-60)=$
$(6+5)*10-5=$
$11*10-5=10$
$110-5=105$