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有理数混合运算

有理数混合运算. 有理数混合运算. 练习. 例 1. 例 3. 例 2. 作业. 练习. 例 2. 依法纳税是每个公民应尽的义务。 《 中华人民共和国个人所得税法 》 规定,公民每月工资薪金不超过 800 元不需缴税。详细税率如下表:. 某企业经理年薪 12 万元,他全年应缴税多少元?. 例 3.“ 算 24 点”. ( 1 ) 7 , 3 , 3 , 7. ( 2 ) 7 , 3 , -3 , 7. ( 3 ) 7 , 3 , -3 , - 7. ( 4 ) 3 , 4 , -6 , 10. 练习.

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有理数混合运算

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  1. 有理数混合运算

  2. 有理数混合运算 练习 例1 例3 例2 作业 练习

  3. 例2.依法纳税是每个公民应尽的义务。《中华人民共和国个人所得税法》规定,公民每月工资薪金不超过800元不需缴税。详细税率如下表:例2.依法纳税是每个公民应尽的义务。《中华人民共和国个人所得税法》规定,公民每月工资薪金不超过800元不需缴税。详细税率如下表: 某企业经理年薪12万元,他全年应缴税多少元?

  4. 例3.“算24点” (1) 7, 3, 3, 7 (2) 7, 3, -3, 7 (3) 7, 3, -3, - 7 (4) 3, 4, -6, 10

  5. 练习 1.填空: (1) -(-2+3-5.1)= (去括号) 2-3+5.1 (2) ()2=169 (3) ||=15 2.互为相反数的两数(零除外)的积的符号是;  和是;商是。 - -1 0 3.0.48的相反数的倒数是。

  6. A

  7. 6.某商品提价25%后欲恢复原价,则应降价 ( )6.某商品提价25%后欲恢复原价,则应降价 ( )  A 20% B 25% C 30% D35% A 7.若a、b互为相反数(a≠ 0,b≠ 0),n是自然数,则下列能成立的结论是 ( ) A a2n与b2n互为相反数 B a2n+1与b2n+1互为相反数 C an与bn互为相反数 D a2与b2互为相反数 B 8.举一个实际例子,使下列算式(1-51%-29%)×2500。 算出结果,并说明结果的实际意义。

  8. 81 2147 2 7 2 7 121 3248 B 3 8 A 3 8 ( ) ( ) 4 9 4 9 54 5 4 4916 4 7 23 D 2536 4 8 C 6 5 ( ) 3 7 ( ) 8 3 9.根据规律完成括号内的填空: 169 4369 964

  9. 作业 书本P62 5,9,11 精选P36 11,15,21

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