能用简便方法计算就用简便方法计算 ①6.9×3.6-4.84÷0.4 ②4.75+8.4÷(9.2-6.8) ③1.2÷[2.5

能用简便方法计算就用简便方法计算 ①6.9×3.6-4.84÷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)
①6.9×3.6-4.84÷0.4,数拦
=24.84-12.1,
=12.74;

②4.75+8.4÷(9.2-6.8),
=4.75+8.4÷2.4,
=4.75+3.5,
=8.25;含毕基

③1.2÷[2.5×(4.3-2.7)],
=1.2÷[2.5×1.6],
=1.2÷4,
=0.3;

④4.5×(0.75-0.356)+9.23,
=4.5×0.394+9.23,
=1.773+9.23,
=11.003;

⑤0.88÷0.8+3.2×1.25,
=1.1+4×0.8×1.25,
=1.1+4×(0.8×1.25)谈谨,
=1.1+4×1,
=1.1+4,
=5.1;

⑥5.4+(0.63+0.555÷1.5),
=5.4+(0.63+0.37),
=5.4+1,
=6.4.