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(满分120分时间120分钟)一、填空题(每小题2分,共18分)1.3的相反数是,-21的倒数是.2.3-27+1-20=,214a2b3=.3.长江中游一水文站在2005年6月汛期观察记录了一周水位变化情况,如表1(单位:cm):表1周一周二周三周四周五周六周日+3+1+4-1+2+4-2每天的数据均表示当日水位比昨日水位上
(120 minutes out of 120 minutes) I. Fill in the blanks (2 points for each question, 18 points in total) The inverse of 1.3 is that the inverse of -21 is .2.3-27+1-20=,214a2b3=.3. The middle reaches of a hydrological station observed in the flood season in June 2005 recorded changes in water level in a week, as shown in Table 1 (unit: cm): Table 1 Tuesday Tuesday Wednesday Thursday Friday Saturday Saturday Sunday +3 +1 +4-1 +2 +4-2 daily figures indicate that the water level is higher than yesterday’s water level