28*1=28
5*2=10
1*0=0
t5 4b6atb4v5ry65e578
(0,8+0,5):10=1,3:10=0,13
5,5:0,44+3,75=12,5+3,75=16,25
8,8:(9,5+1,5)=8,8:11=0,8
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(это проверка)
<span>а)
22,2 : 5 2/7- 2 3/5 = 1 3/5,
1) 22,2 : 5 2/7 = 222/10 : 37/7 = 222/10 * 7/37 = 42/10 = 4 1/5 (или 4,2),
2) 4 1/5 - 2 3/5 = 3 6/5 - 2 3/5 = 1 3/5;
б) (7 1/4 - 6 7/18) * 7,2 + 2,8 = 9,
1) 7 1/4 - 6 7/18 = 7 9/36 - 6 14/36 = 6 45/36 - 6 14/36 = 31/36,
2) 31/36 * 7,2 = 31/36 * 72/10 = 62/10 = 6 1/5 (или 6,2),
3) 6,2 + 2,8 = 9</span>