1、54.9 0.38=,4392,0.38,54.9,1647,20862,20.862,4.05,+37.85,4.05 37.85=,41.90,41.9,1.25 0.70.8 =1.250.80.7 =10.7 =0.7,9.8 25 =4.9(225) =4.950 =245,6.1 3.6+3.63.9 =3.6(6.1+3.9) =3.610 =36,2.96 40=,2.96,40,11840,118.4,1袋牛奶不到2元,1瓶醋不到2元,1盒牙膏不到4元,4盒不到16元,1张小毛巾不到3元,1张大毛巾不到7元,总共不超过2+2+16+3+7=30(元)。够了。,方法一:,方法二
2、:,3.741.251.62.46.6 =(14.81.25+1.6)(2.46.6) =17.559 =26.55(元) 26.5530,够。,8.15.2 =0.60.6100 =0.36100 =36( ) 3642.12,不够。,42.12(),150.25 =50.8=3.754,能。 答:用0.8小时能到学校。,3.75(km),4(km),方法一:,1箱苹果不到39元,1箱梨不到10元,1箱香蕉不到23元,2箱不到46元,总共不超过39+10+46=95(元)。够了。,方法二:,22.8238.29.6 =45.638.29.6 =83.89.6 =93.4(元) 93.4100,够。,(1)2.511=27.5(元) 答:小云家上个月应缴水费27.5元。 (2)2.5123.8(1712)= 2.512+3.85= 3019= 49(元) 答:小可家上个月应缴水费49元。,2.53027.5= 75+27.5= 102.5(元) 答:一共需付102.5元。,0.220.11(93)= 0.22+0.116= 0.220.66= 0.88(元) 答:她这一次通话的费用是0.88元。,