作业帮1)8/3+(-5/2)+(+16/3)+(-11/2)+(3/4-2/3-1/6)X12=?2)4/9X(-9/14)-(-5/9)X(-9/14)-9/14X(-11/9)=?3)1/5X9+1/9X13+1/13X17+...1/101X105=?4)[(-1/2)的平方+(-1/4)X16+4的平方]X[(-3/2)-3]+441/8+1399/14+1399/14X(-7)+1399/25)(-1)+(-1)的平方+(-1)的立方+...
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/26 05:42:58
![1)8/3+(-5/2)+(+16/3)+(-11/2)+(3/4-2/3-1/6)X12=?2)4/9X(-9/14)-(-5/9)X(-9/14)-9/14X(-11/9)=?3)1/5X9+1/9X13+1/13X17+...1/101X105=?4)[(-1/2)的平方+(-1/4)X16+4的平方]X[(-3/2)-3]+441/8+1399/14+1399/14X(-7)+1399/25)(-1)+(-1)的平方+(-1)的立方+...](/uploads/image/z/3744359-71-9.jpg?t=1%298%2F3%2B%28-5%2F2%29%2B%28%2B16%2F3%29%2B%28-11%2F2%29%2B%283%2F4-2%2F3-1%2F6%29X12%3D%3F2%294%2F9X%28-9%2F14%29-%28-5%2F9%29X%28-9%2F14%29-9%2F14X%28-11%2F9%29%3D%3F3%291%2F5X9%2B1%2F9X13%2B1%2F13X17%2B...1%2F101X105%3D%3F4%29%5B%28-1%2F2%29%E7%9A%84%E5%B9%B3%E6%96%B9%2B%28-1%2F4%29X16%2B4%E7%9A%84%E5%B9%B3%E6%96%B9%5DX%5B%28-3%2F2%29-3%5D%2B441%2F8%2B1399%2F14%2B1399%2F14X%28-7%29%2B1399%2F25%29%28-1%29%2B%28-1%29%E7%9A%84%E5%B9%B3%E6%96%B9%2B%28-1%29%E7%9A%84%E7%AB%8B%E6%96%B9%2B...)
1)8/3+(-5/2)+(+16/3)+(-11/2)+(3/4-2/3-1/6)X12=?2)4/9X(-9/14)-(-5/9)X(-9/14)-9/14X(-11/9)=?3)1/5X9+1/9X13+1/13X17+...1/101X105=?4)[(-1/2)的平方+(-1/4)X16+4的平方]X[(-3/2)-3]+441/8+1399/14+1399/14X(-7)+1399/25)(-1)+(-1)的平方+(-1)的立方+...
1)8/3+(-5/2)+(+16/3)+(-11/2)+(3/4-2/3-1/6)X12=?
2)4/9X(-9/14)-(-5/9)X(-9/14)-9/14X(-11/9)=?
3)1/5X9+1/9X13+1/13X17+...1/101X105=?
4)[(-1/2)的平方+(-1/4)X16+4的平方]X[(-3/2)-3]+441/8+1399/14+1399/14X(-7)+1399/2
5)(-1)+(-1)的平方+(-1)的立方+...+(-1)的99次方+(-1)的100次方+1/4+1/28+1/70+...+1/9700
1)8/3+(-5/2)+(+16/3)+(-11/2)+(3/4-2/3-1/6)X12=?2)4/9X(-9/14)-(-5/9)X(-9/14)-9/14X(-11/9)=?3)1/5X9+1/9X13+1/13X17+...1/101X105=?4)[(-1/2)的平方+(-1/4)X16+4的平方]X[(-3/2)-3]+441/8+1399/14+1399/14X(-7)+1399/25)(-1)+(-1)的平方+(-1)的立方+...
1)8/3+(-5/2)+(+16/3)+(-11/2)+(3/4-2/3-1/6)X12
=(8/3+16/3)-(5/2+11/2)+(3*3-2*4-2)
=8-8+9-8-2
=-1
2)4/9X(-9/14)-(-5/9)X(-9/14)-9/14X(-11/9)
=-4/14-5/14+11/14
=2/14
=1/7
3)1/5X9+1/9X13+1/13X17+...1/101X105
=1/4(1/5-1/9)+1/4(1/9-1/13)+1/4(1/13-1/17)+…1/4（1/101-1/105）
=1/4(1/5-1/9+1/9-1/13...+1/101-1/105)
=1/4(1/5-1/105)
=1/21
4)[(-1/2)的平方+(-1/4)X16+4的平方]X[(-3/2)-3]+441/8+1399/14+1399/14X(-7)+1399/2
=（1/4-4+16）（-9/2）+441/8+1399/14+1399/14X(-7)+1399/14*7
=49/4*（-9/2）+441/8+1399/14+0
=-441/8+441/8+1399/14
=1399/14
5)(-1)+(-1)的平方+(-1)的立方+...+(-1)的99次方+(-1)的100次方+1/4+1/28+1/70+...+1/9700
（因为（-1）+（-1）的平方+...+（-1）的99次方+（-1）的100次方=0 ）
所以：
原式=1/4+1/28+...+1/9700
=1/1*4+1/4*7+……+1/97*100
=1/3(1-1/4+1/4-1/7+...+1/97-1/100)
=1/3（1-1/100）
=33/100=0.33
1)-1
2)1/7
3)4/21
1/5×9=1/5-1/9，同理1/101×105=1/101-1/105
∴原式=1/5-1/105=4/21
下面的看不明白题目
1) -1
2)-(1/7)
3)
1，-1。
2，1/7.
3,原式=1/4(1/5-1/9+1/9-1/13...+1/101-1/105)
=1/4(1/5-1/105)=1/21.
4,78609/98
5,因为（-1）+（-1）的平方+...+（-1）的99次方+（-1）的100次方=0
所以原式=1/4+1/28+...+1/9700
=1/3(1-1/4+1/4-1/7+...+1/97-1/100)
=33/100=0.33
1)2.5
2)-(14/25)
3)不清楚
4)不知道
5)...是什么饿