Question

ada yang bisa bantu ga? soal nya ga ngerti btw pake cara ya :D

1. Hasil dari −15 + 8 − (−7) =
2. Hasil dari 7 × (−3) + (−30) ∶ 5 × (−2) =
3. Hasil dari 49 ∶ 7 × (−2) + (−20) ∶ 2 × (−3) =

Answer 1

• 1.) -15 + 8 - (-7)

= (-15 + 8 ) - (-7)

= -(15 - 8 ) - ( -7)

= -7 - (-7)

= -7 + 7

=

• 2.) 7 × (-3) + (-30) ÷ 5 × (-2)

= ( 7 × (-3)) + ((-30) ÷ 5) × (-2)

= -(7 × 3 ) + (-(30 ÷ 5 )) × (-2)

= -21 + (-6) × (-2)

= -21 + ( (-6) × (-2))

= -21 + ( 6 × 2 )

= -21 + 12

= -(21 + 12 )

=

• 3.) 49 ÷ 7 × (-2) + (-20) ÷ 2 × (-3)

= (49 ÷ 7) × (-2) + ((-20) ÷ 2) × (-3)

= 7 × (-2) + (-(20 ÷ 2)( × (-3)

= (7 × (-2)) + (-10) × (-3)

= -(7 × 2 ) + (-10 × (-3))

= -14 + (10 × 3 )

= -14 + 30

= 30 + (-14)

= 30 - 14

=

=========

Answer 2

Catatan:

Untuk soal yang memiliki perkalian/pembagian, perkalian dan pembagiannya dikerajakan terlebih dahulu, kemudian dikerjakan penjumlahan dan pengurangannya.

1.

-15 + 8 - (-7)

= -7 + 7

= 0

2.

7 × (−3) + (−30) ∶ 5 × (−2)

= [7 × (−3)] + [(−30) ∶ 5 × (−2)]

= -21 + 12

= -9

3.

49 ∶ 7 × (−2) + (−20) ∶ 2 × (−3)

= [49 ∶ 7 × (−2)] + [(−20) ∶ 2 × (−3)]

= -14 + 30

= 16