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1、练习四,0,5 4.9 0.3 8 4 3 9 2 1 6 4 7 2 0.8 6 2,4.0 5 3 7.8 5 4 1.9 0,20.862,41.9,1.250.70.8 1.250.80.7 10.7 0.7,9.825 (100.2)25 10250.225 2505 245,2.9640 (30.04)40 3400.0440 1201.6 118.4,6.13.63.63.9 (6.13.9)3.6 103.6 36,1.251.603.7042.406.60 1.251.6014.809.00 26.65(元) 30元,所以够买,房间面积:8.15.242.12(m),所以10
2、0块不够。,100块地砖所铺面积:0.60.610036(m),3642.12,,家离学校的距离:150.253.75(km),所以步行0.8h能到学校。,步行0.8h的路程:50.84(km),43.75,,38.29.622.82 47.845.6 93.4(元),够。,93.4100,,(1) 112.527.5(元),(2) 122.5(1712)3.849(元),27.5302.5 27.575 102.5(元) 答:一共需要付102.5元。,8分29秒3分5分29秒(即按6分钟计算),0.220.1160.88(元),(1) 100g本埠收费为:100200.804.00(元),增加的(135g100g35g)本埠收费1.20元,小亮应付邮费:4.001.205.20(元),(2) 100g外埠收费为:100201.206.00(元),增加的(262g100g162g)外埠收费:2.0024.00(元),小琪应付邮费:6.004.0010.00(元),谢谢观赏,