Question

Zad 12 str 18 ( matematyka z plusem zbiór zadań 1 gimnazjum)
c) 7 3/8 - ( 3 3/4 + 3,125)=
d) 9 1/5 + (3,2-1 2/9)=
e) 11- (12 5/7 - 2,375)=
f) 37 5/8 - (6 3/4 +1,625)=
g) 11 3/4 + (3 2/9 - 1 1/72)=
h) 25 2/13 - (7 1/6 - 2 2/3)=
i) 41 4/15 - ( 23 3/6 - 21,2)=

Answer 1

C) 7 3/8 - ( 3 3/4 + 3,125)= 59/8 - ( 15/4 + 3125/1000) = 59/8 - ( 3750/1000 + 3125/1000 ) = 59/8 - 625/1000 = 7375/1000 - 625/1000 = 6750/1000 = 6,75
 
d) 9 1/5 + (3,2-1 2/9)= 46/5 + ( 32/10 - 11/9) = 46/5 + ( 288/90 - 110/90) = 46/5 + 178/90 = 828/90 + 178/90 = 1006/90 = 11 i 16/90 = 11 i 8/45

e) 11- (12 5/7 - 2,375)= 11 - ( 89/7 - 2375/1000) = 11 - ( 89000/7000 - 16625/7000 ) = 11 - 72375/7000 = 11 - 10 i 19/56 = 1 i 19/56

f) 37 5/8 - (6 3/4 +1,625)= 37,625 - ( 6,75 + 1,625) = 37,625 - 8,375 = 29,25

g) 11 3/4 + (3 2/9 - 1 1/72)= 47/4 + ( 232/72 - 73/72) = 47/4 + 159/72 = 846/72 + 159/72 = 1005/72 = 13 i 69/72 = 13 i 23/24
 
h) 25 2/13 - (7 1/6 - 2 2/3)= 327/13 - ( 43/6 - 8/3) = 327/13 - ( 43/6 - 24/6) = 327/13 - 19/6 = 1962-78 - 247/78 = 1715/78 = 21 i 77/78

i) 41 4/15 - ( 23 3/6 - 21,2)= 619/15 - ( 23,5 - 21,2) = 619/15 - 2,3 = 619/15 - 23/10 = 1238/30 - 69/30 = 1169/30 = 38 i 29/30