2. จงหาผลลัพธ์
1) [10 x (-6)] \(\div\) 4
วิธีทำ
[10 x (-6)] \(\div\) 4
= [-(10 x 6)] \(\div\) 4
= (-60) \(\div\) 4
= -(60 \(\div\) 4)
= -15
= -(60 \(\div\) 4)
= -15
ตอบ -15
2) [(-54) + (-9)] \(\div\) 7
วิธีทำ
[(-54) + (-9)] \(\div\) 7
= [-(54 + 9)] \(\div\) 7
= (-63) \(\div\) 7
= -(63 \(\div\) 7)
= -9
= -(63 \(\div\) 7)
= -9
ตอบ -9
3) (-200) \(\div\) (13 – 53)
วิธีทำ
(-200) \(\div\) (13 – 53)
= (-200) \(\div\) [13 + (-53)]
= (-200) \(\div\) [-(53 – 13)]
= (-200) \(\div\) (-40)
= 200 \(\div\) 40
= 5
= (-200) \(\div\) (-40)
= 200 \(\div\) 40
= 5
ตอบ 5
4) 169 \(\div\) [47 + (-60)]
วิธีทำ
169 \(\div\) [47 + (-60)]
= 169 \(\div\) [-(60 – 47)]
= 169 \(\div\) (-13)
= -(169 \(\div\) 13)
= -13
= -(169 \(\div\) 13)
= -13
ตอบ -13
5) [225 \(\div\) (-15)] · (-3)
วิธีทำ
[225 \(\div\) (-15)] · (-3)
= [-(225 \(\div\) 15)] · (-3)
= (-15) · (-3)
= 15 · 3
= 45
= 15 · 3
= 45
ตอบ 45
6) [(-81) \(\div\) (-3)] – (-23)
วิธีทำ
[(-81) \(\div\) (-3)] – (-23)
= (81 \(\div\) 3) – (-23)
= 27 – (-23)
= 27 + 23
= 50
= 27 + 23
= 50
ตอบ 50
7) -21 + (-440 \(\div\) 11)
วิธีทำ
-21 + (-440 \(\div\) 11)
= -21 + [-(440 \(\div\) 11)]
= -21 + (-40)
= -(21 + 40)
= -61
= -(21 + 40)
= -61
ตอบ -61
8) -1[(-322) \(\div\) (-14)]
วิธีทำ
-1[(-322) \(\div\) (-14)]
= -1(322 \(\div\) 14)
= -1(23)
= -[1(23)]
= -23
= -[1(23)]
= -23
ตอบ -23