Question

a, 19.35 + 55.81 + 19.20

b, 117.98 - 117.46 - 52.17

c, 2 + 4 + 6 + ... + 48 + 50

d, 11 + 12 + 13 + ... + 50

e, 100 - 99 + 98 - 97 + ... + 4 - 3 + 2 - 1

h, 3.37.16 + 24.2.45 + 12.18.4

k, ( 234234.678 - 678678.234 ) : ( 24 + 25 + 26 + ... + 2016 + 2017 )

m, 45.16 + 55.17

Answer 1

a) 5500
b)5200
c)=2(1+2+3...+25)=2.325=650
d)=(11+50)+(12+49)+(13+48)+...(31+30)=1220
 

Answer 2

a)
=5(19.7+11.81+19.4)
=5[19(7+4)+81.11]
=5(19.11+81.11)
=5.11(19+81)
=55.100=5500
b)
=117(98-46)-52.17
=117.52-52.17
=52(117-17)=52.100=5200
e)
=(100-99)+(98-97)+...+(4-3)+(2-1)
=1+1+...+1+1
=50
h)
=3.37.4.4+4.6.2.3.15+6.2.3.6.4
=48.37+48.45+48.16
=48(37+45+16)
=48.88
=4224