4,7 * 10 в одиннадцатой степени - 3,6 * 10 в десятой степени = 4,7 * 3,6 * 10 в степени 11-10 = 16,92 * 10 в первой степени
Решим относительно x с помощью перекрестного умножения.
x =
Пошаговое объяснение:
1-я графа:
a+b=10 7/10 +3 1/5=10 7/10 +3 2/10=10 9/10
a-b=10 7/10 -3 1/5=10 7/10 -3 2/10=7 5/10=7 1/2
2-я графа:
b=14 2/21 -9 3/7=13 23/21 --9 9/21=4 14/21=4 2/3
a-b=9 3/7 -4 2/3=9 9/21 -4 14/21=8 30/21 -4 14/21=4 16/21
3-я графа:
b=15 9/10 -2 3/190=15 171/190 -2 3/190=13 168/190=13 84/95
a+b=15 9/10 +13 84/95=15 171/190 +13 168/190=29 149/190
4-я графа:
a=23-4 3/5=22 5/5 -4 3/5=18 2/5
a-b=18 2/5 -4 3/5=17 7/5 -4 3/5=13 4/5
5-я графа:
a+b=5 7/20 +3 3/10=5 7/20 +3 6/20=8 13/20
a-b=5 7/20 -3 3/10=5 7/20 -3 6/20=2 1/20
6-я графа:
a=6 3/4 +1 5/8=6 6/8 +1 5/8=8 3/8
a+b=8 3/8 +1 5/8=10
7-я графа:
b=7 3/5 -4 3/10=7 6/10 -4 3/10=3 3/10
a-b=4 3/10 -3 3/10=1
Ответ:
1) Jane never visits picture galleries, does she?
2) We have no pets at home, do we?
3) There is no castle in our town, is there ?
4) Jack can't play water polo, can he?
5) There was a river near our country house, wasn't there?
6) Our trip was very interesting, wasn't it?
7) There was no forest there, was there?
8) We never play badminton, do we?