Question

a) 128:4+[2×(2222:22-22:22)]:10

b) 36:9+4 [20+6×(100:4-42:2)]

c) 126-[(63×2:6+109)×(75:25+21:3)]

Answer 1

a)32+[2*(11-1)]:10=32+(2*10):10=32+(20:10)=32+2=34
b)4+4[26*(25-21)]=8(26*4)=
c)126-[(126:115)*(35+7)=126-(1,09*42)=126-45,78=80,22

Answer 2

 a)
128:4+[2×(2222:22-22:22)]:10=
128:4+[2×(101-22:22)]:10=
128:4+[2×(101-1)]:10=
128:4+(2×100):10=
128:4+200:10=
128:4+20=
32+20=52

b)
 36:9+4x[20+6×(100:4-42:2)]=
 36:9+4x[20+6×(25-42:2)]=
 36:9+4x[20+6×(25-21)]=
36:9+4x(20+6x4)=
36:9+4x(20+24)=
36:9+4x44=
4+176=180

c)
126-[(63×2:6+109)×(75:25+21:3)]=
126-[(63×2:6+109)×(3+21:3)]=
126-[(63×2:6+109)×(25+7)]=
126-[(63×2:6+109)×32]=
126-[126:6+109)×32]=
126-[(21+109)x32]=
126-(130x32)=
126-4160=-4034