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  • 1 # 使用者3494949202203

    解:解方程

    題一:

    x - 2.5 = 4.3

    x - (2×10+5)/10 = (4×10+3)/10

    x - 25/10 = 43/10

    x = 43/10 + 25/10

    x = 68/10

    x = 34/5

    ∴x = 6.8

    答:此方程的解為x = 6.8

    題二:

    2.3(x-2.5)=2.76

    2.3x - 23/4 = 69/25

    (23/10)x = 69/25 + 23/4

    (23/10)x = 276/100 + 92/100

    (23/10)x = 851/100

    x = 851/100 ÷ 23/10

    x = 37/10

    ∴x = 3.7

    答:此方程的解為x = 3.7

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