6.9×3.6-4.84÷0.4 ②4.75+8.4÷(9.2-6.8) ③1.2÷[2.5(4.3-2.7)] ④4.5×(0.75-0.356)+9.23 ⑤0.88÷0.8+3.2×1.25 ⑥5.4+(0.63+0.555÷1.5)