Question

tolong di bantu ya....
1.(5 per 7+ 7 per 9) (1+seper 2)
2.(√2+√3) (√2-√3)
sama penyelesaiannya ya...

Answer 1

1) (5/7 + 7/9).(1 + 1/2)
= (45/63 + 21/63).(2/2 + 1/2)
= 66/63 . 3/2
= 33/21
= 1 12/21
= 1 4/7




2) (√2+√3).(√2-√3)
= √2.√2 + √2.(-√3) + √3.√2 + √3.(-√3)
= √4 - √6 + √6 - √9
= 2 - 3
= -1