Question

Pomóżcie! To na jutro!

Answer 1

2.3 a)
2x2x5 
----------- = 5/7
2x2x7
b)
7x3x11
----------- =3/2
11x2x7
c)
5x6x2x7
------------- = 10/3=3 1/3
2x3x7x3
d)
2x2x3x3x5
------------------- =5/15=1/3
4x5x9x3

2.4.
a)
36       2x2x3x3
----- =---------------- =3/4
48      2x2x6x2

72       2x2x2x9
----- = ----------------- =9/16
128     2x2x4x8
b)
44       2x2x11
---- = ---------------- =4/7
77        7x11

84        2x2x3x7
----- = ----------------- =4/5
105      5x3x7
c)
48       2x2x2x2x3
----   = ---------------------- = 2/5
120      2x2x2x3x5

96       2x2x2x2x2x3
------ = ------------------------------- =2/3
144       2x2x2x3x2x3

2.5
a)
27+37
---------- = 64/72=8/9
72
b)
15+33
---------- =48/80=6/10=3/5
 80
c)
w liczniku jest 11 czy coś więcej...
d)
135-39
---------- = 96/120=8/10=4/5
120
e)
247-205
------------- =42/49=6/7
21+28
f)
18x3+2x7     54+14
--------------- =----------------- = 68/85
100-15             85

2.6
a)2/3=12/18
1/5=9/45
4/7=36/63
5/8=45/72
b)7/12=112/192
9/20=153/340
5/18=105/378
9/25=63/175
c)13/24=169/312
15/28=165/308
19/32=285/480
23/45=437/855

2.7
1/2=24/48
2/3=32/48
3/4=36/48
5/6=40/48
7/8=42/48
11/12=44/48
13/16=39/48
21/24=42/48

2.8
a)1/2=4/8=8/16=9/18=25/50=100/200
b)3/5=9/15=12/20=45/75=75/125=180/300
c)7/2=84/24=224/64=420/120=728/208=1960/560
d)9/10=36/40=162/180=225/250=540/600=1800/2000

2.9
a)3/7=9/21
5/8=25/40
6/13=24/52
8/15=32/60
b)5/6=60/72
4/9=100/225
7/10=140/200
12/17=240/340
c)2/5=180/450
3/8=120/320
5/9=400/720
8/23=640/1840

2.10
a)3/4=15/20=36/48=27/36=54/72=180/240
b)
40/60         8/12           800/1200
32/48         2/3               10/15
100/150     118/177        18/27

c)
120/192         245/392        35/56
105/168         5/8               35/56
150/240         140/224         50/80