Proste zadania z 5 klasy podstawowki ułamki -podstawa
zad. 2
a) 2/7*5/8=5/28
b) 1 1/4*2/5=5/4*2/5=1/2
c) 1 13/45*2 1/7=58/45*15/7=58/21=2 16/21
d) 2 3/4*2 2/5=11/4*12/5=33/5=6 3/5
e) 3 1/2*(-2 2/7)=7/2*(-16/7)=-8
f) -4 2/5*(-1 4/11)=-22/5*(-15/4)=33/2=16 1/2
g) 9 13/14*2 5/18=139/14*41/18=5699/252=22 155/252
h) (2 2/3+3 3/4)*4 2/5=(8/3+15/4)*22/5=(32/12+45/12)*22/5=77/12*22/5=
=847/30=28 7/30
a) 1 1/7:1 3/5=8/7*5/8=5/7
b) 1 1/4:1 2/5=5/4*5/7=25/28
c) 2 13/14:2 1/7=41/14*7/15=41/30
d) 3 3/4:5 5/8=15/4*8/45=2/9
e) -3 1/21:2 2/7=-64/21*7/16=-4/3=-1 1/3
f) -4 1/5:(-12 3/5)=-21/5*(-5/63)=1/3
g) 1 2/3:2 1/2 : 3 2/5:2 4/7 = 5/3*2/5 : 17/5*7/18 = 2/3:119/90=
=2/3*90/119=60/119
h) 5 1/3:3 3/4 : 7 1/5:12 4/9=16/3*4/15 : 36/5*9/112=64/45 : 324/560=
=64/45*560/324=35840/14580=2 6680/14580 = 2 334/729
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zad. 2
a) 2/7*5/8=5/28
b) 1 1/4*2/5=5/4*2/5=1/2
c) 1 13/45*2 1/7=58/45*15/7=58/21=2 16/21
d) 2 3/4*2 2/5=11/4*12/5=33/5=6 3/5
e) 3 1/2*(-2 2/7)=7/2*(-16/7)=-8
f) -4 2/5*(-1 4/11)=-22/5*(-15/4)=33/2=16 1/2
g) 9 13/14*2 5/18=139/14*41/18=5699/252=22 155/252
h) (2 2/3+3 3/4)*4 2/5=(8/3+15/4)*22/5=(32/12+45/12)*22/5=77/12*22/5=
=847/30=28 7/30
a) 1 1/7:1 3/5=8/7*5/8=5/7
b) 1 1/4:1 2/5=5/4*5/7=25/28
c) 2 13/14:2 1/7=41/14*7/15=41/30
d) 3 3/4:5 5/8=15/4*8/45=2/9
e) -3 1/21:2 2/7=-64/21*7/16=-4/3=-1 1/3
f) -4 1/5:(-12 3/5)=-21/5*(-5/63)=1/3
g) 1 2/3:2 1/2 : 3 2/5:2 4/7 = 5/3*2/5 : 17/5*7/18 = 2/3:119/90=
=2/3*90/119=60/119
h) 5 1/3:3 3/4 : 7 1/5:12 4/9=16/3*4/15 : 36/5*9/112=64/45 : 324/560=
=64/45*560/324=35840/14580=2 6680/14580 = 2 334/729