101 Lunchbox Notes with Laugh-Out-Loud Jokes for Kids

101 Lunchbox Notes with Laugh-Out-Loud Jokes for Kids

Matematika Persegi panjang dengan ukuran panjang (3x+1)cm, lebar (2x+3)cm, dan keliling nya 98cm. Berapa lebar persegi panjang?

A.21
B.22
C.23
D.24

Persegi panjang dengan ukuran panjang (3x+1)cm, lebar (2x+3)cm, dan keliling nya 98cm. Berapa lebar persegi panjang?

A.21
B.22
C.23
D.24

Jawaban:

Kll = 2 (p + l)

98 = 2 (3x + 1 + 2x + 3)

98 = 2 (5x + 4)

98 = 10x + 8

98 - 8 = 10x

90 = 10x

90 ÷ 10 = x

9 = x

l = 2x + 3

l = 2 (9) + 3

l = 18 + 3

l = 21 cm

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