Bài 1 trang 162 (Luyện tập) SGK Toán 5

Chuyển thành phép nhân rồi tính:

a) \(6,75\)kg \(+\, 6,75\)kg \(+ 6,75\)kg;

b) \(7,14\)m2 \(+ 7,14\)m2 \(+ 7,14\)m2 \(× 3\) ;

c) \(9,26\)dm3 \(× \,9 + 9,26\)dm3.

Lời giải

a) \(6,75kg+ 6,75kg + 6,75kg\) \(= 6,75kg× \,3\) \( = 20,25kg\);

b) \(7,14m^2+ 7,14m^2+ 7,14m^2 × 3 \) \(= 7,14m^2 × ( 1 + 1 +3)\) \(= 7,14m^2 × 5 = 35,7m^2\);

c) \(9,26dm^3 × 9 + 9,26dm^3\) \(= 9,26dm^3 × (9 + 1)\) \( = 9,26dm^3 × 10 = 92,6dm^3\).


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