1.求1又1/2-2又5/6+3又1/12-4又19/20+5又1/30-6又41/42+7又1/56-8又71/72+9又1/90的值.2.已知1的三次方+2的三次方+3的三次方+……+15的三次方=14400,求2的三次方+4的三次方+6的三次方+……+30的三次方值为多少?
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/28 10:34:13
![1.求1又1/2-2又5/6+3又1/12-4又19/20+5又1/30-6又41/42+7又1/56-8又71/72+9又1/90的值.2.已知1的三次方+2的三次方+3的三次方+……+15的三次方=14400,求2的三次方+4的三次方+6的三次方+……+30的三次方值为多少?](/uploads/image/z/9283-67-3.jpg?t=1.%E6%B1%821%E5%8F%881%2F2-2%E5%8F%885%2F6%2B3%E5%8F%881%2F12-4%E5%8F%8819%2F20%2B5%E5%8F%881%2F30-6%E5%8F%8841%2F42%2B7%E5%8F%881%2F56-8%E5%8F%8871%2F72%2B9%E5%8F%881%2F90%E7%9A%84%E5%80%BC.2.%E5%B7%B2%E7%9F%A51%E7%9A%84%E4%B8%89%E6%AC%A1%E6%96%B9%2B2%E7%9A%84%E4%B8%89%E6%AC%A1%E6%96%B9%2B3%E7%9A%84%E4%B8%89%E6%AC%A1%E6%96%B9%2B%E2%80%A6%E2%80%A6%2B15%E7%9A%84%E4%B8%89%E6%AC%A1%E6%96%B9%3D14400%2C%E6%B1%822%E7%9A%84%E4%B8%89%E6%AC%A1%E6%96%B9%2B4%E7%9A%84%E4%B8%89%E6%AC%A1%E6%96%B9%2B6%E7%9A%84%E4%B8%89%E6%AC%A1%E6%96%B9%2B%E2%80%A6%E2%80%A6%2B30%E7%9A%84%E4%B8%89%E6%AC%A1%E6%96%B9%E5%80%BC%E4%B8%BA%E5%A4%9A%E5%B0%91%3F)
1.求1又1/2-2又5/6+3又1/12-4又19/20+5又1/30-6又41/42+7又1/56-8又71/72+9又1/90的值.2.已知1的三次方+2的三次方+3的三次方+……+15的三次方=14400,求2的三次方+4的三次方+6的三次方+……+30的三次方值为多少?
1.求1又1/2-2又5/6+3又1/12-4又19/20+5又1/30-6又41/42+7又1/56-8又71/72+9又1/90的值.
2.已知1的三次方+2的三次方+3的三次方+……+15的三次方=14400,求2的三次方+4的三次方+6的三次方+……+30的三次方值为多少?
1.求1又1/2-2又5/6+3又1/12-4又19/20+5又1/30-6又41/42+7又1/56-8又71/72+9又1/90的值.2.已知1的三次方+2的三次方+3的三次方+……+15的三次方=14400,求2的三次方+4的三次方+6的三次方+……+30的三次方值为多少?
1、1又1/2-2又5/6+3又1/12-4又19/20+5又1/30-6又41/42+7又1/56-8又71/72+9又1/90
=(1-3+3-5+5-7+7-9+9)+(1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
=1+(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10)
=1+(1-1/10)
=1+0.9
=1.9
2、已知1的三次方+2的三次方+3的三次方+……+15的三次方=14400,求2的三次方+4的三次方+6的三次方+……+30的三次方值为多少?
2的三次方+4的三次方+6的三次方+……+30的三次方
=8×(1的三次方+2的三次方+3的三次方+……+15的三次方)
=8×14400
=115200