Bài 5 trang 177 SGK Toán 5

Tìm \(x\): 

             \(8,75 \times x + 1,25 \times x = 20\)

Lời giải

          \(8,75 \times x + 1,25 \times x = 20 \) 

          \( \left({8,75 + 1,25} \right) \times x = 20 \)

          \( 10 \times x\; = 20 \)

          \( \;x = 20:10 \)

          \( \;x = 2\)


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