4. В типографии при печати тиража книги работают 5 принтеров: 1,2,3-й принтеры вместе могут нале чатать весь тираж за 20 часов, 3,4,5-й – за 15 часов. Если в печати участвуют все, кроме 3-го принтера, то на всю работу потребуется 10 часов. Во сколько раз быстрее все пять принтеров напечатают весь тираж, чем только один 3-й принтер?
School uniforms can be different. Someone who likes to loose, someone loves strict . But the classical school uniforms for me still remains white top black bottom . Certainly convenient to walk to school in the free form and mood rises , but then everyone would go to school as the street, and generally will not discipline . In my opinion school uniform should be comfortable, but at the same time practical beautiful. Not necessarily, that would be all the same as one walked . It is important that at least the tone of all forms was the same . Indeed, often it happens that someone shape black , gray someone , and someone even blue . It would be good if there were a choice between sundresses and skirts that you could choose to wear a vest , or simply blouse. And be sure to that would have introduced a day when students can come in free form . One day a week . For example , on Saturday, in a short day , or Monday , that would be preserved the atmosphere of relaxation . General school uniform should first like the student that would go to school with mood.
1) 656 1(целая) 175
481 = 481
2) 712 7(целых) 12 (можно сократить) = 7(целых) 6
100 = 100 50
3) 107 10 2
15 = 7(целых) 15 (можно сократить) = 7(целых) 3
2:
1) 12(цел) 5 - 4(цел) 3 9*12+5 - 9*4+3 = 113 - 39 = 74 = 8(цел) 2
9 9 = 9 9 9 9 9 9
2) 8(цел) 2 - 7(цел) 2 = 9*8+2 - 9*7+2 = 74 - 65 = 9 = 1(цел)
9 9 9 9 9 9 9
3) 25(цел) 3 - 1(цел) = 24(цел) 3
4 4
3: (раскрываем скобки): 1,36-х+1,2=1,06
-х= 1,06-2,56
-х= -1,5
х= 1,5
(проверка): 1,36-(1,5-1,2)=1,06
4:
а) до тысячных: 13,684 284,754
б) до сотых: 13,68 284,75
в) до десятых: 13,7 284,8
г) до единиц: 14 285
5:
1) 6,87+1,55=8,42(кг)-2ой арбуз
2) 21,68-6,87-8,42=6,39(кг)-3ий арбуз
ответ: масса 3его арбуза 6,39 кг