1) 24/32=75/100=33/44=15/20=<span>12/16=6/8=3/4
2)75/125=15/25=6/10=3/5
3)56/60=28/30=14/15
4)45/50=9/10
5)72/81=24/27=8/9
6)33/44=75/100=24/32=15/20=3/4</span>
<span>8 дес. 8ед.=88
7дес. 1 ед. =71
10 дес. =100
9 дес. 6 ед. =96
</span>
1) 57*69=513+342=3933
2)74*47=518+296=3578
3)52*11=52+52=572
)
<u />У+83=243-112
У+83=131
У=131-83
=48
проверка:
243-(48+83)=112
112=112