Toán Lớp 7: 6 phần14 + 5 phần 13 + 4 phần 7

6 /14 + 5/13 + 4/7 - 18 / 13 =(6 /14+ 4/7 )+( 5/13 - 18 / 13) =(3 /7+ 4/7 )+( 5/13 - 18 / 13) =[3+4]/7 + [5-18]/13 =7/7+(-13/13) =1-1 =0

6/14 + 5/13 + 4/7 - 18/13 = (6/14 + 4/7) + (5/13 - 18/13) = (3/7 + 4/7) + (-13/13) = 7/7 + (-1) = 1 + (-1) = 0

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Toán Lớp 7: 6 phần14 + 5 phần 13 + 4 phần 7 – 18 phần 13