把加法算式改写成乘法算式。
(1)2+2+2+2+2___________________
(2)3+3+3_________________________
(3)4+4+4+4______________________
(4)5+5____________________________
(5)6+6+6+6+6___________________
(6) 3+3+3+3__________________________
(7)4+4+4______________________________
(8)1+1+1+1+1+1+1______________________