5класс выполните действия: 1)1/2+4/7-3/4; 2)1/7+2/3-1/2; - вопрос №500250151124734217231232934354 от оспшро 23.10.2021 01:52

Question

Математика: 5класс выполните действия: 1)1/2+4/7-3/4; 2)1/7+2/3-1/2; 3)2/9+3/4-3/5; 4)1/2+1/4+1/8; 5)7/30-2/15+1/6; 6)5/12+5/6-3/4; 7)4/9-3/10+1/2; 8)5/8+1/10-7/25; 9)6/7-41/42+5/12; 10)7/11+4/33-3/4; 11)17/60-19/80+21/40; 12)21/33+13/44-26/55 и желательно подробно например: 5/6+3/4-5/9=30/36+27/36-20/36=30+27-20=37/36

оспшро · Answer

1) 1/2+4/7-3/4=7/14+8/14-3/4=15/14-3/4=30/28-21/28=9/28=3 1/28
2) 1/7+2/3-1/2=3/21+14/21-1/2=17/21-1/2=34/42-21/42=13/42
3) 2/9+3/4-3/5=8/36+27/36-3/5=35/36-3/5=175/180-108/180=67/180
4) 1/2+1/4+1/8=4/8+2/8+1/8=7/8
5) 7/30-2/15+1/6=7/30-4/30+5/30=8/30
6) 5/12+5/6-3/4=5/12+10/12-9/12=6/12=1/2=0,5
7) 4/9-3/10+1/2=40/90-27/90+45/90=58/90=29/45
8) 5/8+1/10-7/25=25/40+4/40-7/25=29/40-7/25=145/200-56/200=89/200=0,445
9) 6/7-41/42+5/12=36/42-41/42+5/12=-5/42+5/12=-10/84+35/84=25/84
10) 7/11+4/33-3/4=21/33+4/33-3/4=25/33-3/4=100/132-99/132=1/132
11) 17/60-19/80+21/40=68/240-57/240+126/240=137/240
12) 21/33+13/44-26/55=84/132+39/132-26/55=123/132-26/55=41/44-26/55=205/220-104/220=101/220