a)-7(2)+18,(5)=11,(3)
b)-3,2(1)+5,4(3)=2,2(2)
c)5 intregi 3/7 + (-4/5)+ (-7 intregi 1/2)=
5 intregi 3/7= 38/7
-7 1/2= -15/2
38/7 -4/5 -15/2 aducem la acelasi numitor
(380-56-525)/70= (380-581)/70= -201/70= -2 intregi 61/70
d)(-1/3)+ (-2/9)+ (-5/-27)+(10/-81)= -1/3 -2/9 +5/27 -10/81 aducem la acelasi numitor
(-27-18+15-10)/81= (-55+15)/81= -40/81
e)-7 intregi 3/8 + 2 intregi 3/4+5,(3)=
-7intregi 3/8= -59/8
2 intregi 3/4= 11/4
5,(3)=5 intregi 3/9= 5 intregi 1/3= 16/3
-59/8 +11/4 +16/3 aducem la acelasi numitor=
(-177+66+128)/24= (-177+194)/24= -17/194
f)2 intregi 1/5 +(-1 intreg 3/4) +9,15 +(-3)= 2 intregi 1/5 -1 intreg 3/4 +9,15 -3
2 intregi 1/5= 11/5
-1 intreg 3/4=-7/4
9,15=9 intregi 15/100= 9 intregi 3/20= 183/20
11/5 -7/4 +183/20 -3 aducem la acelasi numitor
(44-35+183-60)/20= (227-95)/20= -132/20= -6 intregi 12/20
g)-3,2(5)+6,4(32)+(-7/9)=
-3,2(5)=-3 intregi (25-2)/90=-3 intregi 23/90= -293/90
6,4(32)=6 intregi (432-4)/990= 6 intregi 428/990= 6368/990
-293/90 +6368/990 -7/9 aducem la acelasi numitor
(-3223+6368-770)/990= (-3993+6368)/990= 2375/990 =2 intregi 395/990
= 2 intregi 79/198