= (-15 + 8 ) - (-7)
= -(15 - 8 ) - ( -7)
= -7 - (-7)
= -7 + 7
=
= ( 7 × (-3)) + ((-30) ÷ 5) × (-2)
= -(7 × 3 ) + (-(30 ÷ 5 )) × (-2)
= -21 + (-6) × (-2)
= -21 + ( (-6) × (-2))
= -21 + ( 6 × 2 )
= -21 + 12
= -(21 + 12 )
= (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
=========
Catatan:
Untuk soal yang memiliki perkalian/pembagian, perkalian dan pembagiannya dikerajakan terlebih dahulu, kemudian dikerjakan penjumlahan dan pengurangannya.
1.
-15 + 8 - (-7)
= 0
2.
7 × (−3) + (−30) ∶ 5 × (−2)
= [7 × (−3)] + [(−30) ∶ 5 × (−2)]
= -9
3.
49 ∶ 7 × (−2) + (−20) ∶ 2 × (−3)
= [49 ∶ 7 × (−2)] + [(−20) ∶ 2 × (−3)]
= 16
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= (-15 + 8 ) - (-7)
= -(15 - 8 ) - ( -7)
= -7 - (-7)
= -7 + 7
=
= ( 7 × (-3)) + ((-30) ÷ 5) × (-2)
= -(7 × 3 ) + (-(30 ÷ 5 )) × (-2)
= -21 + (-6) × (-2)
= -21 + ( (-6) × (-2))
= -21 + ( 6 × 2 )
= -21 + 12
= -(21 + 12 )
=
= (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
=
=========
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