Question

Calculati:
a )
( 9 x 7 - 6 : 3) - (81 - 8 x 8 ) =
(8 x 5 :10 +6 x 6 ) - (10 +3 x 3 )=
73 - 4 x 3 + ( 53 - 24 : 8 x 6 ) =
33 +9 : 3 x 10 - (60 : 10 x 4 - 20 ) =
( 14 + 8 : 8 ) : 5 + 5 - ( 29 - 3 : 3 ) : 4 =
5 x 5 + 49 : 7 ) : 4 =
99 - ( 13 +6 x 5 - 8 : 4 ) + 5 x 5 =
b)
50 x 10 =
500 X 10 =
80 x 10 =
80 x 100 =
30 : 10 =
300 : 10 =
500 : 10 =
500 : 100 =

Answer 1

(63-3)-(81-64)=60-17=43
(40:10+36)-(10+9)=40-19=21
73-12+(53-18)=73-12+35=96
33+30-4=59
(14+1):5+5-(29-1):4=15:5+5-28:4=3+5-7=1
(25+7):4=32:4=8
99-(13+30-2)+25=99-41+25=83