2.3.5.11.13.17.19.等等等都是()

2.3.5.11.13.17.19.等等等都是()


2.3.5.11.13.17.19.等等等都是(質數)



算式2*3*5*7*11*13*17積的各位時尚的數位之和是多少


2*3*5*7*11*13*17=510510
各數位之和為12



2/9-6/13×2/9 36×(17/18-2/9)4/13×4/7-3/7×4/13


2/9-6/13×2/9
=2/9x(1-6/13)
=2/9x7/13
=12/117
36×(17/18-2/9)
=36x17/18-36x2/9
=34-8
=26
4/13×4/7-3/7×4/13
=4/13x(4/7-3/7)
=4/13x1/7
=4/91



-9又2/3+(-13又7/8)-2003.3-8-(-7又2/3)-(+17/8)-(-2003.3)=


-9又2/3+(-13又7/8)-2003.3-8-(-7又2/3)-(+17/8)-(-2003.3)
=-9又2/3+7又2/3-13又7/8-2又1/8-2003.3+2003.3-8
=-2-16+0-8
=-26