(1)59:x=245:1.8(2)[(1.4+1.6×214)×(1÷819-2.375)]+2.901(3)2007×20082008-2008×20072007(4)12+122+123+124+…+1211.-数学
题文
(1)
(2)[(1.4+1.6×2
(3)2007×20082008-2008×20072007 (4)
|
答案
(1)
2.8x=1, x=
(2)[(1.4+1.6×2
=[1.4+3.6]×0+2.901, =2.901, (3)2007×20082008-2008×20072007 =2007×2008×10001-2008×2007×10001, =0; (4)
= |