oblicz
nina: dane sa liczby x=2√7+4 oraz y=5−3√7 oblicz x+y x−y xy x/y
30 lis 17:06
magda: x+y=2√7+4+5−3√7=9−√7
30 lis 20:14
magda: x−y=(2√7+4)−(5−3√7)=2√7+4−5+3√7=5√7−1
30 lis 20:15
magda: xy=(2√7+4)(5−3√7)=10√7−42+20−12√7=−2√7−22
30 lis 20:16
magda: | x | | 2√7+4 | | 5+3√7 | |
| = |
| |
| = |
| y | | 5−3√7 | | 5+3√7 | |
| 10√7+42+20+12√7 | | 22√7+62 | |
| = |
| = |
| 25−63 | | −38 | |
30 lis 20:22