4.9 SPM Practis (Kertas 1)
Soalan 5:
Diberi bahawa (3 x)(x−1)=(18),
cari nilai x.
Penyelesaian:
(3 x)(x−1)=(18)
[3 × x + x (–1)] = (18)
3x – x = 18
2x = 18
x = 9
Soalan 6:
Penyelesaian:
(34−23)(5−2)=((3)(5)+(4)(−2)(−2)(5)+(3)(−2)) =(15−8−10−6) =(7−16)Soalan 7:
(24−3401)(1−3)=
Penyelesaian:
Peringkat hasil darab dua matriks=(3×2)(2×1)=(3×1)
(24−3401)(1−3)=(2(1)+4(−3)(−3)(1)+0(−3)(4)(1)+1(−3)) =(2−12−3+04−3) =(−10−31)
Soalan 8:
(1 −1 2)(51−3204)=
Penyelesaian:
Peringkat hasil darab dua matriks
=(1×3)(3×2)=(1×2)
(1 −1 2)(51−3204)=
= (1×5 + (–1)(–3) + (2)(2) 1×1 + (–1)(0) + (2)(4))
= (5 + 3 + 4 1 + 0 + 8)
= (12 9)