初中數(shù)學(xué)人教 版八年級(jí)下冊(cè) 測(cè)試2 課件

1、寶坻區(qū)王卜莊初級(jí)中學(xué) 楊 華But there is another reason for the hign repute of mathematics：it is mathematics that offers the exact natural sciences a certainmeasure of security which，without mathematics，they could not attain一、挑戰(zhàn)基本功C CB BC C一、挑戰(zhàn)基本功D DA AC C一、挑戰(zhàn)基本功B BD D圖圖4一、挑戰(zhàn)基本功B B一、挑戰(zhàn)基本功But there is another reas

2、on for the hign repute of mathematics：it is mathematics that offers the exact natural sciences a certainmeasure of security which，without mathematics，they could not attain二、能力檢測(cè) 5二、能力檢測(cè)96二、能力檢測(cè)But there is another reason for the hign repute of mathematics：it is mathematics that offers the exact natu

3、ral sciences a certainmeasure of security which，without mathematics，they could not attain三、規(guī)范書寫三、規(guī)范書寫B(tài)ut there is another reason for the hign repute of mathematics：it is mathematics that offers the exact natural sciences a certainmeasure of security which，without mathematics，they could not attain如圖

4、，將圓柱體的側(cè)面展開。AB1 1.有一個(gè)圓柱有一個(gè)圓柱, ,它的高等于它的高等于1212厘米厘米, ,底面半徑等于底面半徑等于3 3厘米厘米, ,在圓柱下底在圓柱下底面上的面上的A A點(diǎn)有一只螞蟻點(diǎn)有一只螞蟻, ,它想從點(diǎn)它想從點(diǎn)A A爬到點(diǎn)爬到點(diǎn)B B 螞螞(的值取的值取3)3)蟻沿著圓柱側(cè)面爬行的最短路程是多少蟻沿著圓柱側(cè)面爬行的最短路程是多少? ?ACB12r339解： AC=r9 BC=12三角形ABC是直角三角形，AB122291448122515答：最短路程是15 厘米。四、挑戰(zhàn)自我2.如圖，長(zhǎng)方體的高為如圖，長(zhǎng)方體的高為3cm，底面是邊長(zhǎng)為，底面是邊長(zhǎng)為2cm的正的正方形?，F(xiàn)有一

5、小蟲從頂點(diǎn)方形?，F(xiàn)有一小蟲從頂點(diǎn)A出發(fā)，沿長(zhǎng)方體側(cè)面到達(dá)出發(fā)，沿長(zhǎng)方體側(cè)面到達(dá)頂點(diǎn)頂點(diǎn)C，小蟲走的路程最短為多少厘米？，小蟲走的路程最短為多少厘米？ACC1B1C2B2解：如圖，畫出長(zhǎng)方體的側(cè)面展開圖。ACABB C22221111345答：小蟲走的路程最短為5厘米。AB1=3，B1C1=4，AB2=5，B2C2=2，5229ACABB C22222222 25But there is another reason for the hign repute of mathematics：it is mathematics that offers the exact natural sciences a certainmeasure of security which，without mathematics，they could not attainBut there is another reason for the hign repute of mathematics：it is mathematics that offers the exact natur