1.2.1 Nombor Berarah, Praktis Berformat PT3


1.2.1 Nombor Berarah, Praktis Berformat PT3
Soalan 1:
Lengkapkan pengiraan yang berikut.
4.6×( 3 5 1 3 4 )=4.6×( 0.6 x ) =4.6× x = x

Penyelesaian:
4.6×( 3 5 1 3 4 )=4.6×( 0.6 1.75 ) =4.6× 1.15 = 5.29


Soalan 2:
Lengkapkan pengiraan yang berikut.
43+35÷1 1 6 =43+35÷ 7 6                      =43+35× x                      =43+ x                      =13

Penyelesaian:
43+35÷1 1 6 =43+35÷ 7 6                      =43+35× 6 7                      =43+ 30                      =13



Soalan 3:
Hitungkan setiap yang berikut.
  (a) (–9) × 14
  (b)   6.7 – 3.2 × (–0.5)  
  (c) –144 ÷ (–8) ÷ (–2)   

Penyelesaian:
 (a) (–9) × 14 = –126
 (b)   6.7 – 3.2 × (–0.5) = 6.7 – (–1.6)
= 6.7 + 1.6
 = 8.3
 (c) –144 ÷ (–8) ÷ (–2) = –144 ÷ 4
= 36


Soalan 4:
Hitungkan nilai bagi
0.6+( 1 2 3 )÷( 4 15 )2

Penyelesaian:
0.6+( 1 2 3 )÷( 4 15 )2 =0.6+[ 5 3 × 15 5 4 ]2 =0.6+[ 25 4 ]2 =0.66 1 4 2 =0.66.252 =7.65



Soalan 5:
Hitungkan nilai bagi
( 0.6×1 1 4 )[ 1.6×( 1.5 ) ]÷0.4

Penyelesaian:
( 0.6×1 1 4 )[ 1.6×( 1.5 ) ]÷0.4 =( 0.6 0.3 × 5 4 2 )[ 1.6 4 ×( 1.5 ) 0.4 1 ] = 1.5 2 6 =0.756 =6.75


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