Page 54 - Hybrid PBD 2021 Form 2 - Matematik

BAB

3 Rumus Algebra

Algebraic Formulae

3.1 Rumus Algebra Nota Buku Teks
PBD
PBD
PBD
Algebraic Formulae Visual ms. 45 – 50
FOKUS TOPIK

Rumus algebra/ Algebraic formula • Ungkapan algebra – gabungan dua atau lebih sebutan algebra
Ungkapan algebra menggunakan operasi.
Algebraic expression Algebraic expression – combination of two or more algebraic terms using operations.
Perkara rumus a = 5b + c • Rumus algebra – ungkapan algebra yang ditulis dalam bentuk
Subject of formula persamaan dengan menghubungkan beberapa pemboleh ubah.
Pemboleh ubah/ Variables Algebraic formula – an algebraic expression which is written in the form of an equation
by relating few variables.
Tip Penting

Perkara rumus/ Subject of formula:
• Nilai pekali mesti bersamaan 1./ The coefficient must equal to 1.
• Diungkapkan dalam sebutan pemboleh ubah lain./ Expressed in terms of other variables.

1. Tulis satu rumus algebra berdasarkan situasi berikut. SP 3.1.1 TP2
Write an algebraic formula based on the following situations.

Hasil tambah bagi 6p dan 3q ialah S. Tulis satu rumus bagi S. S = 6p + 3q
The sum of 6p and 3q is S. Write a formula for S.

(a) Sofea membeli 40 kg beras dan menggunakan y kg beras itu setiap hari.
Selepas 2 minggu, baki beras yang tinggal ialah x kg. Tulis satu rumus bagi x. x = 40 – 14y
Sofea bought 40 kg of rice and used y kg of it every day. After 2 weeks, x kg of rice is left. Write a
formula for x.
(b) Kuasa tiga bagi suatu nombor P ialah Q. Tulis satu rumus bagi Q. Q = P 3
The cube of a number P is Q. Write a formula for Q.
(c) Sebuku roti berharga RM2.40 dan sebotol jem berharga RM7.50. Jian Wei
membayar RMJ untuk p buku roti dan q botol jem. Tulis satu rumus bagi J. J = 2.4p + 7.5q
A loaf of bread costs RM2.40 and a bottle of jam costs RM7.50. Jian Wei paid RMJ for p loaf of
bread and q bottle of jam. Write a formula for J.

2. Lengkapkan peta titi di bawah. SP 3.1.1 TP1 i-Think Peta Titi
i-Think
i-Think
Complete the bridge map below.
Perkara rumus P = mcθ m = y – 3
2
Subject A = 2πr + 2πrh t x + 3
seperti seperti
Faktor penghubung as as
Relating factor A P m
3. Tanda (✓) bagi pemboleh ubah dalam kurungan yang ditulis sebagai perkara rumus. SP 3.1.1 TP1
Mark (✓) for the variable in brackets that is written as subject of formula.
(a) S = 3a + 2b – 4c [S] (b) p = pq + 2q [p] 1 1 1
(c) + = [c]
a b c
✓

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