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tuanhanam120
2 năm trước
a, Tính 3/7+5/8=........... 4/9+7/18=....... 59/56-5/8=.......... 5/6-4/9 =............... 1/2+1/3+1/4=............ 13/12-(1/2+1/3) b , Tính nhẩm 2/7+3/7=....... 3/5+2=............. 2 3/5-2=............. 2-3/5=................. c , Tính bằng cách thuận tiện nhất 2/5+3/4+1/4=..................................... 30/4-6/8-15/20=...............................................
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