Toán Lớp 5: tính nhanh 1.27+2.77+4.27+5.77+7.27+8.77+10.27+11.77+13.27+14.77 -

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Toán Lớp 5: tính nhanh 1.27+2.77+4.27+5.77+7.27+8.77+10.27+11.77+13.27+14.77