№ 1011
г) 5 7/19 - 4 16/19 = 4 26/19 - 4 16/19 = 10/19;
д) 9 5/16 - 5 9/16 = 8 21/16 - 5 9/16 = 3 12/16 = 3 3/4
е) 8 8/25 - 7 18/25 = 7 33/25 - 7 18/25 = 15/25 = 3/5
№ 1012
г) 18 14/45 - 1 7/15 = 824/45 - 22/15 = (824 - 66) /45 = 758/45 = 16 35/45 = 16 7/9
д) 27 2/39 - 6 5/13 = 1055/з9 - 83/13 = (1055 - 249) / 39 = 806/39 = 20 26/39 = 20 2/13
е) 23 34 - 2 7/17 = 791/34 - 41/17 =(791 - 82)/ 34 = 709 / 34 = 20 29/34
№ 1013
г) 13 1/24 - 1 11/18 = 313/24 - 29/18 =( 939 - 116) / 72 = 823/72 = 11 31/72
д) 13 1/18 - 10 1/12 = 235/18 - 121/12 = (470 - 363) / 36 = 107/36 = 2 35/36
е) 16 2/25 - 12 2/15 = 402/25 - 182/15 = (1206 - 910) / 75 = 296/75 = 3 71/75
№3
3х+4у= 6 ⇒ х= (6-4у)/3
-5х-2у=4 ⇒ -5(6-4у)/3 -2у= 4 ⇒ -10 +20у/3 -2у=4 ⇒ 20у/3-2у= 4+10 ⇒
(20у-6у)/3 = 14 ⇒ 14у/3= 14
14у=14×3
14у= 42
у=42/14
у= 3
х= (6-4×3)/3= (6-12)/3= -6/3= -2
Площадь.
7*5 = 35 см^2.
Периметр.
(7*2)+(5*2) = 14 + 10 = 24 см.
<span>5см6мм*40+5км760м-3м5см*142=56мм*40+5760м-305см=5762,24-305=5759,19м
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