Пошаговое объяснение:
а) (2/15 +1 7/12)·30/103 -2÷2 1/4 ·9/32 +2 1/3=1/2 -1/4 +2 1/3=6/12 -3/12 +2 4/12=2 7/12
1) 2/15 +1 7/12=8/60 +1 35/60=1 43/60=103/60
2) 103/60 ·30/103=1/2
3) 2÷2 1/4=2·4/9=8/9
4) 8/9 ·9/32=1/4
б) (7 1/2 ·2 2/3 -12 1/4 ÷7/9)÷6+3 1/8 +5 2/7=17/24 +3 1/8 +5 2/7=9 5/42
1) 7 1/2 ·2 2/3=15/2 ·8/3=5·4=20
2) 12 1/4 ÷7/9=49/4 ·9/7=(7·9)/4=63/4=15 3/4
3) 20-15 3/4=19 4/4 -15 3/4=4 1/4=17/4
4) 17/4 ÷6=17/4 ·1/6=17/24
5) 17/24 +3 3/24=3 20/24=3 5/6
6) 3 5/6 +5 2/7=3 35/42 +5 12/42=8 47/42=9 5/42
в) 5 1/3 ÷6 2/5 +(12÷3 3/5 -2/3)·2/3 +7 2/5=5/6 +1 7/9 +7 2/5=10 1/90
1) 5 1/3 ÷6 2/5=16/3 ·5/32=5/(3·2)=5/6
2) 12÷3 3/5=12·5/18=(2·5)/3=10/3
3) 10/3 -2/3=8/3
4) 8/3 ·2/3=16/9=1 7/9
5) 5/6 +1 7/9=15/18 +1 14/18=1 29/18=2 11/18
6)2 11/18 +7 2/5=2 55/90 +7 36/90=9 91/90=10 1/90
г) 21 2/59 -2/5 ·(3 15/28 ÷9/28 -1÷1 10/49)÷2=21 2/59 -2 2/59=19
1) 3 15/28 ÷9/28=99/28 ·28/9=11
2) 1÷1 10/49=1·49/59=49/59
3) 11 -49/59=10 59/59 -49/59=10 10/59=600/59
4) 2/5 ·600/59=(2·120)/59=240/59
5) 240/59 ÷2=240/59 ·1/2=120/59=2 2/59
как-то так
Пошаговое объяснение:
а) (2/15 +1 7/12)·30/103 -2÷2 1/4 ·9/32 +2 1/3=1/2 -1/4 +2 1/3=6/12 -3/12 +2 4/12=2 7/12
1) 2/15 +1 7/12=8/60 +1 35/60=1 43/60=103/60
2) 103/60 ·30/103=1/2
3) 2÷2 1/4=2·4/9=8/9
4) 8/9 ·9/32=1/4
б) (7 1/2 ·2 2/3 -12 1/4 ÷7/9)÷6+3 1/8 +5 2/7=17/24 +3 1/8 +5 2/7=9 5/42
1) 7 1/2 ·2 2/3=15/2 ·8/3=5·4=20
2) 12 1/4 ÷7/9=49/4 ·9/7=(7·9)/4=63/4=15 3/4
3) 20-15 3/4=19 4/4 -15 3/4=4 1/4=17/4
4) 17/4 ÷6=17/4 ·1/6=17/24
5) 17/24 +3 3/24=3 20/24=3 5/6
6) 3 5/6 +5 2/7=3 35/42 +5 12/42=8 47/42=9 5/42
в) 5 1/3 ÷6 2/5 +(12÷3 3/5 -2/3)·2/3 +7 2/5=5/6 +1 7/9 +7 2/5=10 1/90
1) 5 1/3 ÷6 2/5=16/3 ·5/32=5/(3·2)=5/6
2) 12÷3 3/5=12·5/18=(2·5)/3=10/3
3) 10/3 -2/3=8/3
4) 8/3 ·2/3=16/9=1 7/9
5) 5/6 +1 7/9=15/18 +1 14/18=1 29/18=2 11/18
6)2 11/18 +7 2/5=2 55/90 +7 36/90=9 91/90=10 1/90
г) 21 2/59 -2/5 ·(3 15/28 ÷9/28 -1÷1 10/49)÷2=21 2/59 -2 2/59=19
1) 3 15/28 ÷9/28=99/28 ·28/9=11
2) 1÷1 10/49=1·49/59=49/59
3) 11 -49/59=10 59/59 -49/59=10 10/59=600/59
4) 2/5 ·600/59=(2·120)/59=240/59
5) 240/59 ÷2=240/59 ·1/2=120/59=2 2/59
Пошаговое объяснение:
как-то так