Question

Oblicz
a 6 4/9 + 2 2/7
b 8 3/4 - 4 4/5
c 2 5/8 x 3 2/3
d 0,2 x 2,8
e 1 4/5 : 13 1/2
f 4,2 : 0,07

Answer 1

A) 6 4/9 + 2 2/7 =
= 6 28/63 + 2 18/63 =
= 8 46/63

b) 8 3/4 - 4 4/5 =
= 8 15/20 - 4 16/20 =
= 7 35/20 - 4 16/20 =
= 3 19/20

c) 2 5/8 • 3 2/3 =
= 21/8 • 11/3 =
= 7/8 • 11/1 =
= 77/8 =
= 9 5/8

d) 0,2 • 2,8 =
= 2/10 • 28/10 =
= 1/5 • 14/5 =
= 14/25

e) 1 4/5 : 13 1/2 =
= 9/5 : 27/2 =
= 9/5 • 2/27 =
= 1/5 • 2/3 =
= 2/15

f) 4,2 : 0,07 =
= 42/10 : 7/100 =
= 21/5 • 100/7 =
= 3/1 • 20/1 =
= 60/1 =
= 60

Answer 2

A)6 4/9 + 2 2/7 =58/9+16/7=74/16=4,625
b) 8 3/4 - 4 4/5=35/4 - 24/5=1 (skracamy ułamki)
c) 2 5/8×3 2/3=21/8×11/3=77/8=9,625
d)0,2×2,8=1/5×28/10=28/50=0,56
e) 1 4/5 :13 1/2=9/5:27/2=18/10:135/10=0,1/10=0,01
f) 4,2:0,07=420/100:70/100=6/10

Proszę bardzo :-)