
presentasi
Presentation
•
Mathematics
•
7th Grade
•
Hard
Fitriyani Fitriyani
Used 2+ times
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8 Slides • 0 Questions
1
2
Permasalahan 1
Toko suka maju merupakan toko mainan anak-anak.
Pemilik toko dalam menjual kelereng, ia mengemas
kelereng-kelereng ke dalam kotak-kotak, yaitu kotak
merah dan kotak putih. Zaid membeli 15 kotak merah
dan 9 kotak putih dari toko suka maju. Pada keesokan
harinya Zaid diberi kakanya7 kotak merah dan 3 kotak
putih. Maka dari itu berapa total kelereng yang dimiliki
oleh Zaid?
3
(3x – y + 4) + (-x + 2y – 5)
= 3x – y + 4 + -x + 2y – 5
= 3x – x – y + 2y +4 - 5
Jabarkan
Kumpulkan suku sejenis
= 2x – y - 1
Hitung operasi yang sejenis
4
(5x – 2y + 13) - (3x + 9y - 4)
= 5x – 3x – 2y – 9y + 13 + 4
= (5x – 3x) (– 2y – 9y) (13 + 4)
Jabarkan
Kumpulkan suku sejenis
= 2x -11y + 17
Hitung operasi yang sejenis
5
Perhatikan gambar berikut!
6
Pengelola suatu lapangan bola akan mempebaharui rumputnya
disebabkan rumput yang sekarang memiliki kualitas yang belum
cukup bagus. Sebelum membeli rumputyang akan dijadikan
sebagai ganti rumput yang lama, pihak pengelola akan mengukur
luas lapangan bola tersebut. Lapangan tersebut memiliki Panjang
dalam bentuk aljabar 10x + 12 dan lebarnya 7x – 15. Maka
berapakah luas lapangan yang akan ditanami rumput tersebut ?
7
Jawab :
(10x + 12) . (7x – 15)
= 70x2 + 70x + 84x -180
= 70x2 + 154x -180
8
Refleksi :
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