题目内容

脱式计算(能简算的要简算)
(1)36+59+41+5                       (2)372×54+372×46
(3)1462-369-631                     (4)3000÷125÷8
(5)48×125                          (6)99×63+63
(7)78×102                          (8)99×85
(9)118+306÷17+265                  (10)540÷45×(65+35)
分析:(1)运用加法的交换律、结合律简算;
(2)运用乘法分配律简算;
(3)根据连续减去两个数,等于减去这两个数的和简算;
(4)根据连续除以两个数,等于除以这两个数的积简算;
(5)把48×125写成125×8×6简算;
(6)把99×63+63写成99×63+1×63的形式,运用乘法分配律简算;
(7)把78×102写成78×(100+2)的形式,运用乘法分配律简算;
(8)把99×85写成(100-1)×85的形式,运用乘法分配律简算;
(9)118+306÷17+265 先算除法,再从左向右计算;
(10)先做小括号的加法,把45写成9×5,再简算.
解答:解:(1)36+59+41+5,
=(36+5)+(59+41),
=41+100,
=141;

(2)372×54+372×46,
=372×(54+46),
=372×100,
=37200;

(3)1462-369-631,
=1462-(369+631),
=1462-1000,
=462;

(4)3000÷125÷8,
=3000÷(125×8),
=3000÷1000,
=3;

(5)48×125,
=125×(8×6),
=(125×8)×6,
=1000×6,
=6000;

(6)99×63+63,
=99×63+1×63,
=63×(99+1),
=63×100,
=6300;

(7)78×102,
=78×(100+2),
=78×100+78×2,
=7800+156,
=7956;

(8)99×85,
=(100-1)×85,
=100×85-1×85,
=8500-85,
=8415;

(9)118+306÷17+265,
=118+18+256,
=136+256,
=392;

(10)540÷45×(65+35),
=540÷45×100,
=540÷(9×5)×100,
=540÷9÷5×100,
=60÷5×100,
=12×100,
=1200.
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.
练习册系列答案
相关题目

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网