a, = 47 . ( 36 + 64 )
= 47 . 100 = 4700
b, = -43 + 1315 - 126 - 1315 - 57
= ( - 43 - 57 ) - 126
= - 100 - 126
= -226
c, = 19 . ( 35 - 2 + 67 )
= 19 . 100 = 1900
d, = -25 + 117 - 117 + 25
= 0
d)=-25+117-117+25
=(-25+25)+(117-117)
=0
A) 47.36+47.64
=47.(36+64)
=47.100
4700
B) (-43+1315-126)-(1315+57)
=-43+1315-126-1315-57
=[(-43)+(-57)]+(1315-1315)-126
=(-100)+0-126
=-226
C) 19.35-19.2+67.19
=19.(35-2+67)
=19.100
1900
D) (-25+117)+(-117)+25
=[(-25)+25]+[117+(-117) ]
=0+0=0