1) 9,38+10-5,38=19
2) -8,76+3,25+10,76=5,25
3) -6,19-1,5+5,19=-2,5
4) 21,4-12,7-20,4+12,7=1
1)15*2=30
2)14*2=28
3)13*2=26
4)30-28=2
5)2+26=28
6)28:18=1.5
7)489+1.5=490.5
(5 5/7 * 3/8 - 5 1/4 : 7) : 3 + 3 3/28 - 1/2 = 3 целых 1/14
1) 5 5/7 * 3/8 = 40/7 * 3/8 = (5*3)/(7*1) = 15/7 = 2 1/7
2) 5 1/4 : 7 = 21/4 : 7 = 21/4 * 1/7 = (3*1)/(4*1) = 3/4
3) 2 1/7 - 3/4 = 2 4/28 - 21/28 = 1 32/28 - 21/28 = 1 11/28 = 39/28
4) 39/28 : 3 = 39/28 * 1/3 = (13*1)/(28*1) = 13/28
5) 13/28 + 3 3/28 = 3 16/28 = 3 4/7
6) 3 4/7 - 1/2 = 3 8/14 - 7/14 = 3 1/14