Bài 2 trang 175 SGK Toán 5

Tìm \(x\) :

\(a) \;x + 3,5 = 4,72 + 2,28\) ;                    \( b) \;x - 7,2 = 3,9 + 2, 5\)

Lời giải

a) \(x + 3,5 = 4,72 + 2,28  \)   

    \(x + 3,5 = 7\)

    \(x = 7 - 3,5  \)

    \(x = 3,5 \)

b) \(x - 7,2 = 3,9 + 2, 5\)

    \(x - 7,2= 6,4\)

    \( x = 6,4 + 7,2\)

    \(x = 13,6\)

 

 

    

            

            


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