Toán Lớp 4: ????ℎ???? ????????????̂́???? ????ℎ????̂???? ????ℎ????̛̃ ????????̂́ 3 ????????̀???? ????????̂???? ????ℎ????̉???? 1 ????????̂́ ????ℎ????̀ ????????̂́ đ????́ ????????̆???????? ????????̂???? 138 đ????̛???? ????????̣ . ????