解题思路:(1)(6)运用乘法分配律简算;(2)把分数和百分数化为小数,运用乘法分配律简算;(3)运用加法交换律与结合律简算;(4)先算括号内的除法,再算括号内的减法,最后算括号外的乘法;(5)运用除法的性质简算.
(1)3.7×99+3.7,
=3.7×(99+1),
=3.7×100,
=370;
(2)[3/4]×7.7+3.3×0.75-75%,
=0.75×7.7+3.3×0.75-0.75,
=0.75×(7.7+3.3-1),
=0.75×10,
=7.5;
(3)5.93+0.64+0.07+0.36,
=(5.93+0.07)+(0.64+0.36),
=6+1,
=7;
(4)(7.9-3.06÷0.68)×1.5,
=(7.9-4.5)×1.5,
=3.4×1.5,
=5.1;
(5)78÷2.5÷0.4,
=78÷(2.5×0.4),
=78÷1,
=78;
(6)105×([1/3]+[1/5]),
=105×[1/3]+105×[1/5],
=35+21,
=56.
点评:
本题考点: 小数四则混合运算;运算定律与简便运算;整数、分数、小数、百分数四则混合运算.
考点点评: 完成本题要注意分析式中数据,运用合适的简便方法计算.