题目内容
计算下面各题(能简算的要简算) (1)35×(26÷2+7) |
(2)400÷[480÷(16+8)] | (3)78×26+26×22 |
(4)57×101-57 | (5)125×(8+4) | (6)(86+19)×(95-69) |
分析:(1)先算小括号里面的除法,再算小括号里面的加法,最后算括号外的乘法;
(2)先算小括号里面的加法,再算中括号里面的除法,最后算括号外的除法;
(3)、(4)、(5)运用乘法分配律简算;
(6)先算出小括号里面的得数,然后再运用乘法分配律简算.
(2)先算小括号里面的加法,再算中括号里面的除法,最后算括号外的除法;
(3)、(4)、(5)运用乘法分配律简算;
(6)先算出小括号里面的得数,然后再运用乘法分配律简算.
解答:解:(1)35×(26÷2+7),
=35×(13+7),
=35×20,
=700;
(2)400÷[480÷(16+8)],
=400÷[480÷24],
=400÷20,
=20;
(3)78×26+26×22,
=(78+22)×26,
=100×26,
=2600;
(4)57×101-57,
=57×(101-1),
=57×100,
=5700;
(5)125×(8+4),
=125×8+125×4,
=1000+500,
=1500;
(6)(86+19)×(95-69),
=105×26,
=(100+5)×26,
=100×26+5×26,
=2600+130,
=2730.
=35×(13+7),
=35×20,
=700;
(2)400÷[480÷(16+8)],
=400÷[480÷24],
=400÷20,
=20;
(3)78×26+26×22,
=(78+22)×26,
=100×26,
=2600;
(4)57×101-57,
=57×(101-1),
=57×100,
=5700;
(5)125×(8+4),
=125×8+125×4,
=1000+500,
=1500;
(6)(86+19)×(95-69),
=105×26,
=(100+5)×26,
=100×26+5×26,
=2600+130,
=2730.
点评:乘法分配律是常用的简便运算的方法,要熟练掌握,灵活运用.
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