1. a)
[tex]40 - (7 \times 4) - 12 \\ = 40 - 28 - 12 \\ = 0[/tex]
1. b)
[tex]21 \times (16 - 8) \div 3 \\ = 21 \times 8 \div 3 \\ = 168 \div 3 \\ = 56[/tex]
1.c)
[tex](78 - 13) \div 5 \times 6 \\ = 65 \div 5 \times 6 \\ = 13 \times 6 \\ = 78[/tex]
1.d)
[tex]108 \div (24 + 12) + 7 \div \\ = 108 \div 36 + 7 \\ = 3 + 7 \\ = 10[/tex]
2.a)
[tex]16 - ( - 7) + (9 \times ( - 4)) \\ = 16 + 7 + ( - 36) \\ = 23 + ( - 36) \\ = - 13[/tex]
2.b) 125:(15-(-10))+25
= 125 : (15+10) + 25
= 125 : 25 + 25
= 5 + 25
= 30
2.c) 648 : (-18) - (-11) × (-8)
= 648 : (-18) + 11 × (-8)
= -36 + 11 × (-8)
= -36 + (-88)
= -124
2.d) 34×8+420:7-156
= 272 + 420:7 - 156
= 272 + 60 - 156
= 332 - 156
= 176
3. a) 13+(-8)-9+k = 7
→ 5-9+k = 7
→ -4 + k = 7
→ k = 7 - (-4)
→ k = 7+4
→ k = 11
No 4.b. itu kayaknya jawabannya salah deh
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