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-18+6 = -12
-14-(-23) = -14+23=9
b) -6*7 = -42
-8 *(-9) = -(-8*9)= -(-72)=72
-75:3= -25
c) 3/5 + 2 całe i 2/5 =3/5+12/5=3
5 całych i 9/11+6/11 =64/11+6/11=70/11=6 4/11
1 cała i 4/7 +2 całe i 5/7=11/7+19/7=30/7=4 2/7
d) 10- 1/3 =29/3=9 2/3
12 1/5 - 4/5 =61/5-4/5=57/5=11 2/5
3 całe i 1/7 -4=22/7-4= -6/7
e) 2/11 *5 =10/11
5/8 *2/3 =5/12
(-2/3 ) * (-3/8)= -(-2/3*3/8)= -(-1/4)=1/4
f) 2/5 : 3 =2/15
3/7 : 1/2=6/7
-5/8 : 1/3 = -15/8= -1,875
g) 0,8 +0,4 =1,2
1,2-0,7 =0,5
2,1 - 3= -0,9
h) 0,3*2 =0,6
1,6*(-3) = -1,6*3= -4,8
0,4 : 2 =0,2