Tính nhanh : 5/6 x 1/7 + 5/6 x 4/7 + 5/6 x 2/7 + 18
2 câu trả lời
56 × 17 + 56 × 47 + 56 × 27 + 18
= 56 × ( 17 + 47 + 27 ) + 18
= 56 × 77 + 18
= 56 × 1 + 18
= 56 + 18
= 56 + 1086
= 1136
56 × 17 + 56 × 47 + 56 × 27 + 18
= 56 × ( 17 + 47 + 27 ) + 18
= 56 × 77 + 18
= 56 × 1 + 18
= 56 + 18
= 56 + 1086
= 1136