Найти 40% от числа: 1,7: (8.1/3-(1/3.+0,5+1/4): - вопрос №20642024017813130514433136072230 от Анастасияя12345 22.03.2020 09:30

Question

Математика: Найти 40% от числа: 1,7: (8.1/3-(1/3.+0,5+1/4): (4,3-3.13/60)*7,2) 2/3*0,375+4.7/18+(2.2/3-7/15): 0,8-4.7/18 это дробь /-это дробная черта

Анастасияя12345 · Answer

1,7:(8.1/3-(1/3.+0,5+1/4):(4,3-3.13/60)*7,2)=
=1,7:(8.1/3-(5/6+1/4):(4,3-3.13/60)*7,2)=
=1,7:(8.1/3-1 1/12:1 1/12*7,2)=
=1,7:(8.1/3-1 *7,2)=
=1,7:(8.1/3-7 1/5)=
=1,7:1 2/15=
=1 1/2=
=1,5

1/3.+0,5=1/3+5/10=1/3+1/2=2/6+3/6=5/6
5/6+1/4=10/12+3/12=13/12=1 1/12
4,3-3.13/60=4 3/10-3 13/60=43/10-193/60=258/60-193/60=65/60=1 5/60 =1 1/12
1 1/12:1 1/12=13/12:13/12=13/12*12/13=1
1 *7,2=7,2=7 2/10=7 1/5
8 1/3-7 1/5=25/3-36/5=125/15-108/15=17/15=1 2/15
1,7:1 2/15=1 7/10:1 2/15=17/10:17/15=17/10*15/17=3/2=1,5

40% от 1,5=1,5:100*40=0,6

2/3*0,375+4.7/18+(2.2/3-7/15):0,8-4.7/18=
=2/3*0,375+4.7/18+2 1/5:0,8-4.7/18=
=1/4+4.7/18+2 1/5:0,8-4.7/18=
=1/4+4.7/18+2 3/4-4.7/18=
=1/4+2 3/4=
=3

2.2/3-7/15=8/3-7/15=40/15-7/15=33/15=2 3/15=2 1/5
2/3*0,375=2/3*375/1000=2/3*3/8=1/4
2 1/5:0,8=2 1/5:8/10=11/5:4/5=11/5*5/4=11/4=2 3/4
4.7/18-4.7/18=0
1/4+2 3/4=1/4+11/4=12/4=3

40% от 3=3:100*40=1,2