解题思路:(1)运用乘法的交换律、结合律进行简算,
(2)先算除法,再算加法,
(3)运用减法的运算定律进行简算,先减去3.68,再减去4.8,
(4)先分别算出除法和乘法,再算减法,
(5)从左向右进行计算即可,
(6)先算小括号里的除法,再算小括号里的加法,最后算括号外的除法,
(7)先算小括号里的减法,再运用乘法的分配律进行简算,
(8)先算小括号里的减法,再算中括号里的除法,最后算括号外的乘法.
(1)0.25×6.82×4,
=(0.25×4)×6.82,
=1×6.82,
=6.82;
(2)1.344+0.162÷4,
=1.344+0.0405,
=1.3845;
(3)12.68-4.8-3.68,
=12.68-3.68-4.8,
=9-4.8,
=4.2;
(4)3.6÷1.2-0.8×2.7,
=3-2.16,
=0.84;
(5)9.2×1.05÷3.4,
=9.66÷3.4,
≈2.84
(6)(2.6+3.2÷1.28)÷1.7,
=(2.6+2.5)÷1.7,
=5.1÷1.7,
=3.00;
(7)6.83×(3.8-2.3)+1.5×3.7,
=6.83×1.5+1.5×3.7,
=(6.83+3.7)×1.5,
=10.53×1.5,
=15.795;
(8)4.5×[7.68÷(8.2-1.8)],
=4.5×[7.68÷6.4],
=4.5×1.2,
=5.4.
点评:
本题考点: 小数四则混合运算;运算定律与简便运算.
考点点评: 此题考查了小数四则混合运算的顺序,灵活运用运算定律进行简算,要细心、认真计算,防止出错.