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我很聪明.会用简便方法计算.376+28+172+12443000÷8÷12599×38+3825×1048×688-534+112-166156×101-156164-83-1726×148-48×

编辑:chaxungu时间:2026-04-27 08:58:27分类:小学数学题库

我很聪明,会用简便方法计算.

376+28+172+12443000÷8÷12599×38+38
25×1048×(29×125)688-534+112-166
156×101-156164-83-1726×148-48×26.
解:(1)376+28+172+124,
=(376+124)+(28+172),
=500+200,
=700;

(2)43000÷8÷125,
=43000÷(8×125),
=43000÷1000,
=43;

(3)99×38+38,
=38×(99+1),
=38×100,
=3800;

(4)25×104,
=25×(100+4),
=25×100+25×4,
=2500+100,
=2600;

(5)8×(29×125),
=8×125×29,
=1000×29,
=29000;

(6)688-534+112-166,
=(688+112)-(534+166),
=800-700,
=100;

(7)156×101-156,
=156×(101-1),
=156×100,
=15600;

(8)164-83-17,
=164-(83+17),
=164-100,
=64;

(9)26×148-48×26,
=26×(148-48),
=26×100,
=2600.
分析:(1)运用加法交换律和加法结合律简算;
(2)根据除法的性质简算;
(3)(7)(9)运用乘法分配律简算;
(4)先把104分解成(100+4)再运用乘法分配律简算;
(5)运用乘法交换律和结合律简算;
(6)运用加法结合律和减法的减法的性质简算;
(8)根据连续减去两个数,等于减去这两个数的和简算.
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.