A 25+(x–25).5=5. 4 mũ 2 B 3.(x+3)+19=7 mũ 2 C x mũ 2=81 d x=[(1800+600):30]=560:(315-35)

A 25+(x–25).5=5. 4 mũ 2
B 3.(x+3)+19=7 mũ 2
C x mũ 2=81
d x=[(1800+600):30]=560:(315-35)

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  1. A,25+(x-25).5=5. 4²

    ⇔25+(x-25).5=5.4.4

    25+(x-25).5=20.4

    25+(x-25).5=80

    (x-25).5=80-25

    (x-25).5=55

    x-25=55:5

    x-25=11

    x=11+25

    x=36

    B,3.(x+3)+19=7²

    ⇔3.(x+3)+19=7.7

    3.(x+3)+19=49

    3.(x+3)=49-19

    3.(x+3)=30

    x+3=30:3

    x+3=10

    x=10-3

    x=7

    C,x²=81

    ⇔x.x=81

    x=9

    D,x:[(1800+600):30]=560:(315-35)

    x:[2400:30]=560:280

    x:80=2

    x=80.2

    x=160

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