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10*31=310
40*10=400
100*72=7200
700:10=10
400:10=40
2100:100=21
2)
11cm=1,1dm
11cm=11cm
11cm=110mm
40*10 = 400
100*72 = 7200
700:10 = 70
400:10 = 40
2100:100 = 21
2)
11cm = 1,1dm
1,1dm = 11cm = 110mm
x*31=310 /: 31
x= 10
40*x=400 /:40
x= 10
x*72=7200 /:72
x=100
700:x=70 /*x
700 = 70x czyli 70x=700 /:70
x=10
długość 11 cm = 1,1 dm = 0,11 m = 110 mm
x:10=40 /*10
x=400
2100:x =21 /*x
2100= 21x czyli 21x=2100 /: 21
x=100