a)=87+113+249=200+249=449
b)=268+732+79=1000+79=1079
c)=
d)=37.24+37.76=37.(24+76)=100
d) =23.56+23.44 + 77.38+77.62 =23.(56+44)+77.(38+62)=23.100+77x100=100.(77+23)=100.100=1000000
HT
a. 87 + 249 + 113 b. 268 + 79 + 732 c. 37 . 24 + 37 . 76 d. 23 . 56 + 23 . 44 + 77 . 38 + 77 . 62
= ( 87 + 113 ) + 249 = ( 268 + 732 ) + 79 = 37 . ( 24 + 76 ) = 23 . ( 56 + 44 ) + 77 . ( 38 + 62 )
= 200 + 249 = 1000 + 79 = 37 . 100 = 23 . 100 + 77 . 100
= 449. = 1079. = 3700. = ( 23 + 77 ) . 100 = 100 . 100 = 10000.