1)
4 1/6 * 2 2/5 = (25 * 12) /(6 * 5) = (5*2)/(1*1) = 10/1 = 10
2 1/10 * 2 1/7 = (21* 15) /(10*7) = (3*3)/(2*1) = 9/2 = 4 1/2
1 7/8 * 2 2/5 = (15*12) /(8*5) = (3 * 3 ) /(2*1) = 9/2 = 4 1/2
2 2/21 * 3 1/2 = (44 * 7) / (21 * 2) = (22 * 1) /(3*1)=22/3 = 7 1/3
2)
V = 3 1/8 * 1 2/5 * 1 3/5 = (25 *7 *8) /( 8 * 5*5) = 7/1 = 7 дм³
3)
( 4 1/12 * 1 5/7 - 5 2/9 ) * 3/8 =2/3
1) 4 1/12 * 1 5/7 = 49/12 * 12/7 = 7/1 =7
2) 7 - 5 2/9 = 1 7/9
3) 1 7/9 * 3/8 = 16/9 * 3/8 = (2*1)/(3*1) = 2/3
(3/8 + 2 1/7 * 1 1/20) * 1 1/3 = 3 1/2
1) 2 1/7 * 1 1/20 = 15/7 * 21/20 = (3*3)/(1*4)=9/4 = 2 1/4
2) 3/8 + 2 1/4 = 3/8 + 2 2/8 = 2 5/8
3) 2 5/8 * 1 1/3 = 21/8 * 4/3 = (7*1)/(2*1)=7/2 = 3 1/2