50 : 16 = 3 (ост. 2)
проверка:
3*16 +2 = 48 +2 =50
80 : 25 = 3 (ост. 5)
проверка:
3 * 25 + 5 = 75 + 5=80
70 : 30 = 2 (ост. 10)
проверка:
2*30 +10 = 60 +10=70
85 :35 = 2 (ост. 15)
проверка:
2*35 + 15 = 70 +15 = 75
Следующее число 109
4 (+7) 11 (+14) 25 (+28) 53 (+56) 109
3(х+5)+4х=3х+15+4х=7х+15
8(7+х)-3х=56+8х-3х=56+5х
9(х-7)+6х=9х-63+6х=15х-63
5( x+8)-11=5х+40-11=5х+29
2(13+ x)-15=26+2х-15=11+2х
6( x+5)+2 x=6х+30+2х=8х+30
( 6 1/8 - 1,75 ): (9- 2,2 ( 5 6/11 - 3,5) ) * 1 2/7 = 1 1/4
1) 6 1/8 - 1 75/100 = 6 1/8 - 1 3/4 =
=6 1/8 - 1 6/8 =4 3/8
2) 5 6/11 - 3,5 = 5 6/11- 3 1/2 =
= 5 12/22 - 3 11/22 = 2 1/22
3) 2,2 * 2 1/22 = 22/10 * 45/22 =
= 45/10 = 9/2 = 4 1/2
4) 9 - 4 1/2 = 4 1/2
5) 4 3/8 : 4 1/2 = 35/8 : 9/2 =
= 35/8 * 2/9 = (35*1) / (4*9) = 35/36
6) 35/36 * 1 2/7 = 35/36 * 9/7 =
=(5*1)/ (4*1) =5/4 = 1 1/4
4х*13-1,9*13=0,4*3,2
52х-24,7=1,28
52х=1,28+24,7
52х=25,98
х=25,98:52=1299/26000