题目内容
怎样简便就怎样计算
63+152+137+148= | 102×99= | 645-180-245= |
382×101-382= | 125×24= | 35×8+35×6-4×35= |
1280÷16÷4= | 890-147-53= | 32×25×125= |
分析:①运用加法的结合律及交换率进行解答即可.
②④⑥运用乘法的分配律进行解答即可.
③⑧运用一个数减去两个数,可以用这个数减去这两个数的和进行解答即可.
⑤⑨运用乘法的结合律及交换率进行解答即可.
②④⑥运用乘法的分配律进行解答即可.
③⑧运用一个数减去两个数,可以用这个数减去这两个数的和进行解答即可.
⑤⑨运用乘法的结合律及交换率进行解答即可.
解答:解:①63+152+137+148,
=(63+137)+(148+152),
=200+300,
=500;
②102×99,
=(100+2)×99,
=9900+198,
=10098;
③645-180-245,
=(645-245)-180,
=400-180,
=220;
④382×101-382,
=382×(101-1)
=382×100,
=38200;
⑤125×24,
=(125×8)×3,
=1000×3,
=3000;
⑥35×8+35×6-4×35,
=35×(8+6-4),
=35×10,
=350;
⑦1280÷16÷4,
=1280÷(16×4),
=1280÷64,
=20;
⑧890-147-53,
=890-(147+53),
=890-200,
=690;
⑨32×25×125,
=(25×4)×(125×8),
=100×1000,
=100000.
=(63+137)+(148+152),
=200+300,
=500;
②102×99,
=(100+2)×99,
=9900+198,
=10098;
③645-180-245,
=(645-245)-180,
=400-180,
=220;
④382×101-382,
=382×(101-1)
=382×100,
=38200;
⑤125×24,
=(125×8)×3,
=1000×3,
=3000;
⑥35×8+35×6-4×35,
=35×(8+6-4),
=35×10,
=350;
⑦1280÷16÷4,
=1280÷(16×4),
=1280÷64,
=20;
⑧890-147-53,
=890-(147+53),
=890-200,
=690;
⑨32×25×125,
=(25×4)×(125×8),
=100×1000,
=100000.
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.
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