解题思路:(1)先根据积不变规律把777×9变成111×63,再运用乘法分配律简算;
(2)根据连续减去两个数等于减去这两个数的和;
(3)运用加法结合律简算;
(4)按照从左向右的顺序计算;
(5)运用乘法分配律简算;
(6)先把乘法变成乘法,再运用乘法结合律简算;
(7)运用加法结合律简算;
(8)运用乘法分配律简算;
(9)运用乘法分配律简算;
(10)先把996变成995+1,再运用乘法分配律简算.
(1)777×9+111×37,
=111×63+111×37,
=111×(63+37),
=111×100,
=11100;
(2)5-[2/3]-[1/3],
=5-([2/3]+[1/3]),
=5-1,
=4;
(3)[7/9]+[4/11]-[4/9]+[7/11],
=([7/9]-[4/9])+([4/11]+[7/11]),
=[1/3]+1,
=1[1/3];
(4)[3/5]÷[1/5]×5,
=[3/5]×5×5,
=3×5,
=15;
(5)72÷1.2+72÷1.8,
=60+40,
=100;
(6)9+3÷7÷6×14,
=9+[3/7]×[1/6]×14,
=9+[3/7]×14×[1/6],
=9+6×[1/6],
=9+1,
=10;
(7)[2/7]+[2/5]+[3/7]+[3/5],
=([2/7]+[3/7])+([2/5]+
点评:
本题考点: 运算定律与简便运算;分数的简便计算;分数的四则混合运算;小数四则混合运算.
考点点评: 运算定律是常用的简便运算的方法,要熟练掌握,灵活运用.