a.1+2+3+4+ +78 b.2+4+6+ +100 c.23+24+ +88
Matematika
oohsehunparkchanyeol
Pertanyaan
a.1+2+3+4+ +78
b.2+4+6+ +100
c.23+24+ +88
b.2+4+6+ +100
c.23+24+ +88
1 Jawaban
-
1. Jawaban Adeaaz875
a.1/2 x n ( 2 x a + ( n -1 ) x 1)
1/2 x 78 ( 2 x 1 + ( 78 - 1 ) x 1)
39 ( 2 + 77 )
39 ( 79)
39 x 79 = 3.081
b.1/2 x n ( 2.a + ( n -1) x 1 )
1/2 x 99( 2 x 2 + ( 99 - 1)x 1)
1/2 x 99 ( 4 + 98 )
1/2 x 99 ( 102 )
99 x 51 = 5.049
c.1/2 x n ( 2 x a + ( n - 1 ) x 1 )
1/2 x 66 ( 2 x 23 + ( 66 - 1 ) x1 )
33 ( 46 + 65 )
33 ( 111 )
33 x 111 = 3.663