Вычеслите: 1) 2 2/5-(1/4+7/10);2) 9 -( 1 5/8+3/20);3) 3-(1/6+2/3);4) 4 5/6- (2 3/8+7/12).ПОМОГИТЕЕЕ.СПАСПАСИБО БОЛЬШОЕ!!!!

1)

2 2/5 - (1/4 + 7/10) = 2,4 - (0,25 + 0,7) = 2,4 - 0,95 = 1,45

2)

9 - (1 5/8 + 3/20) = 9 - (1 25/40 + 6/40) = 9 - 1 31/40 = 8 40/40 - 1 31/40 = 7 9/40 = 7,225

3)

3 - (1/6 + 2/3) = 3 - (1/6 + 4/6) = 3 - 5/6 = 2 6/6 - 5/6 = 2 1/6

4)

4 5/6 - (2 3/8 + 7/12) = 4 5/6 - (2 9/24 + 14/24) = 4 5/6 - 2 23/24 = 4 20/24 - 2 23/24 = 3 44/24 - 2 23/24 = 1 21/24 = 1 7/8 = 1,875