tolong bantu dong...................................
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Nomor 1a
[tex]45 + ( - 14) \\ = 45 - 14 \\ = 31[/tex]
Nomor 1b
[tex] - 28 + ( - 19) \\ = - 28 - 19 \\ = - 47[/tex]
Nomor 1c
[tex]4.6 + ( - 8.7) \\ = 4.6 - 8.7 \\ = - 4.1[/tex]
Nomor 1d
[tex] - 3.75 + ( - 2.56) \\ = - 3.75 - 2.56 \\ = - 6.31[/tex]
Nomor 1e
[tex] \frac{5}{7} + \frac{3}{4} = \frac{20 + 21}{28} = \frac{41}{28} = 1 \frac{13}{28} [/tex]
Nomor 2a
[tex]15 - 38 \\ = - 23[/tex]
Nomor 2b
[tex] - 27 - 18 \\ = - 45[/tex]
Nomor 2c
[tex] - 43 - ( - 12) \\ = - 43 + 12 \\ = - 31[/tex]
Nomor 2d
[tex]2.28 - ( - 1.75) \\ = 2.28 + 1.75 \\ = 4.03[/tex]
Nomor 2e
[tex] \frac{2}{5} - \frac{7}{10} = \frac{4 - 7}{10} = - \frac{3}{10} [/tex]
Nomor 3a
[tex]25 + ( - 7) - ( - 15) - 10 \\ =( 25 - 7) + 15 - 10 \\ =( 18 + 15) - 10 \\ = 33 - 10 \\ = 23[/tex]
Nomor 3b
[tex]30 - 18 + ( - 4) - ( - 20) \\ =( 30 - 18) - 4 + 20 \\ =( 12 - 4 )+ 20 \\ = 8 + 20 \\ = 28[/tex]
Nomor 3c
[tex] \frac{2}{3} + ( - \frac{3}{4} ) - \frac{1}{6} \\ \\ = \frac{2}{3} - \frac{3}{4} - \frac{1}{6} \\ \\ = \frac{8 - 9 - 2}{12} \\ \\ = - \frac{3}{12} = - \frac{1}{4} [/tex]
Nomor 4a
[tex]27 \times ( - 4) \\ = - 108[/tex]
Nomor 4b
[tex] - 23 \times ( - 14) \\ = 322[/tex]
Nomor 4c
[tex]4.6 \times ( - 2.5) \\ = - 11.5[/tex]
Ingat!
- Negatif × Negatif = Positif
- Negatif × Positif = Negatif
- Positif × Negatif = Negatif
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Jawaban:
a
1.45+(-14)=45-14=39
2.(-28)+(-19)= -28-19= -(28+19)= -47
3.4,6+(- 8,7)= 4,6-8,7= -4,1
4.(-3,75)+(-2,56)= -3,75-2,56= -(3,75+2,56)= -6,31
[tex]5. \frac{5}{7} + \frac{3}{4} = \frac{20 + 21}{28} = \frac{41}{28} [/tex]
b.
1.15-38=-23
2.(-27)-18= -(27+18)= -45
3.(-43)-(-12)= -43+12= -31
4.2,28 -(-1,75)= 2,28 + 1,75=4,03
[tex]5. \frac{2}{5} - \frac{7}{10} = \frac{10 - 70}{10} = - \frac{60}{10} = - 6[/tex]c.
1.25+(-7)-(-15)-(10)= 25-7+15-10=18+15-10=33-10= 23
2.30-18+(-4)-(-20)=30-18-4+20=12-4+20=8+20=28
3
[tex] \frac{2}{3} + ( - \frac{3}{4})- \frac{1}{6} = \frac{2}{3} - \frac{3}{4} - \frac{1}{6} = \frac{8 - 9 - 2}{12} = - \frac{3}{12} = -\frac{1}{4} [/tex]d.
1.27x(-4)= -108
2.(-23)×(-12)=276
3.4,6×(-2,5)= -11,5
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