巧算分数加减法(1)
内容精要
在分数的加减运算过程中,虽然掌握运算法则是关键,大师犹豫习题的类型较多,特点不一,因此在解题时,还要通过观察和分析,找出题目中数的特点,合理、有效地进行计算。
常用的方法有:拆项相加法、凑整、倒序求和法、错位相减法和分组法等。
例1.计算:1+3fdfdd2aaaa125d4b9b3386103d4c44a3.png+5343a241c63d219b63bb365dc3fad756c.png+7e0cbd961eb7c70c3f83a4e3f49f5ebba.png+91d3fc4544c4e440ae02b329535bc1cb2.png+11dd4e2b3eb40c00fccbf1e0bd93b558a7.png
例2.计算下面各题
1 2-df4344a8d214cca83c5817f341d32b3d.png-7c1bc20c016ab66f2b43e99fbf038c45.png-fdfdd2aaaa125d4b9b3386103d4c44a3.png ⑵(1df4344a8d214cca83c5817f341d32b3d.png-7c1bc20c016ab66f2b43e99fbf038c45.png+395220691f780148c416c2ea9856fe5d.png)-(395220691f780148c416c2ea9856fe5d.png+6b947573d14816876763af57c7a89b2e.png)
例3.求下列所有的分母不超过10的真分数的和:
df4344a8d214cca83c5817f341d32b3d.png+(7c1bc20c016ab66f2b43e99fbf038c45.png+6b947573d14816876763af57c7a89b2e.png)+(70e7efdd0b858341812e625a071abd09.png+f5011a7fb622d329c50a2b84376eb6de.png+265e19a4ae0afb453ff050334cc577b1.png)+…+(1b7fcaa2e80f3cc459ba13babb1338cb.png+1ee4792a6dad2b02f50ff856c58eb07d.png+a90658887586a2212d073c9b8e9396c7.png+…+75c9243c84c16f20efe9c70ccaebd6f8.png+db8d3b757b4d84b898061097977ff8a5.png)
例4.计算:1+75afe788124c42d26ea8aabcc291963d.png+2cbc030243674314ea6f72babdbe554b.png+9d2563e5ca8fb467fea39e4158529138.png
例5.计算:c113385884680c5a56aa9a3fd363f8d1.png+c42290dcaae9df86f226aac60342d31a.png+d5416cd8271ff996562b5f30ed7245b1.png+ef19a09052b0f45cfda292645013badf.png+22b2ebd14dff4434a82c7386146e452e.png+a3157223e99de0dda0ac7f0ca3624f76.png+df161682b68325dc1214c1343ff216b1.png+d0fee63a3df334382b088fe4850dcbe8.png
例6.计算:df4344a8d214cca83c5817f341d32b3d.png+70e7efdd0b858341812e625a071abd09.png+bc763c40c1afc46fbe981d117a65141c.png+b1d6892b74104ce6241a2486e5877b35.png+e00d81c057c261163aa7e91e142f3146.png+a481253f36e0c73b6b170336e66c6df3.png+93022f9c4c8d84cd586d9b53be3b66c8.png
例7.计算:df4344a8d214cca83c5817f341d32b3d.png+fdfdd2aaaa125d4b9b3386103d4c44a3.png+343a241c63d219b63bb365dc3fad756c.png+e0cbd961eb7c70c3f83a4e3f49f5ebba.png+1d3fc4544c4e440ae02b329535bc1cb2.png
五年级上册巧算分数加减法练习题