1. Oblicz
2
a) 4 --- -1,45 = ?
15
b) 1i 5/7 x 1,2= ?
c) 8 i 1/3 : 8,75 = ?
d) 1,2+ 3 1/50+20= ?
e) 30,5 -1 i 7/20 = ?
f) 1 i 1/4 x 10,7 = ?
g) 3,28 : 1 i 3/4 = ?
h) 20- 6,5 x 3 i 1/25 = ?
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a) 4 2/15 -1,45 = 4 2/15 - 1 9/20= 4 8/60- 1 27/60=3 68/60-1 27/60=2 41/60
b) 1i 5/7 x 1,2=12/7 * 6/5= 72/35=2 1/7
c) 8 i 1/3 : 8,75 =25/3 :35/4=25/3 * 4/35= 20/21
d) 1,2+ 3 1/50+20=1,2+3,02+20=24,22
e) 30,5 -1 i 7/20 =30,5-1,35=29,15
f) 1 i 1/4 x 10,7 = 1,25*10,7=13,375
g) 3,28 : 1 i 3/4 =3,28:1,75= w przybliżeniu 1,87
lub
g) 3,28 : 1 i 3/4 =82/25*4/7=328/175=1 153/175
h) 20- 6,5 x 3 i 1/25 = 20-6,5*3,04=20-19,76=0,24