Matematika

Pertanyaan

1.a+8=7
2.a-4=10
3.2a+5=21
4.10-a=15

1 Jawaban

  • 1) a + 8 = 7
    a = 7 - 8
    a = -1

    2) a - 4 = 10
    a = 10 + 4
    a = 14

    3) 2a + 5 = 21
    2a = 21 - 5
    2a = 16
    a = 16 ÷ 2
    a = 8

    4) 10 - a = 15
    -a = 15 - 10
    -a = 5
    a = 5 ÷ (-1)
    a = -5

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