2005*0.375-0.375*1949 3.75*2.4的简便计算
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3.7*10.1-0.37=3.7*10.1-3.7*0.1=3.7*(10.1-0.1)=3.7*10=37
0.125+(0.37+2.63)
0.37/0.25=(0.37×4)÷(0.25×4)=1.48÷1=1.48再问:你4是怎么来的再答:利用商不变的规律被除数和除数同时乘4,商不变
2005×3/8-0.375+1949+3.75×10.4=2005×0.375-0.375+1949+3.75×10.4=2004×0.375+1949+39=751.5+1949+39=2739.
3.65*4.7-36.5*0.37=36.5*0.47-36.5*0.37=36.5*(0.47-0.37)=3.65
1.86*13.7-18.6*0.37=1.86*13.7-1.86*3.7=1.86*(13.7-3.7)=1.86*10=18.6
2005×38-0.375×1949+3.75×2.4=2005×0.375-0.375×1949+3.75×2.4=2005×0.375-0.375×1949+0.375×24=(2005-1949
0.37*99+0.37=0.37*(99+1)=0.37*100=371.23+3.77-0.56-1.44=(1.23+3.77)-(0.56+1.44)=5-2=33.14/0.4/2.5=3.
原式=(0.37+0.29+2)*(0.37+0.29)+(0.37+0.29+2)*0.17-[(2+0.37+0.29)*(0.37+0.29)+0.17*(0.37+0.29)]=(0.37+0
2005*3/8—0.375*1949+3.75*10.4=2005*3/8—0.375*1949+0.375*104=(2005-1949+104)×3/8=160×3/8=60
原式=(2.7*5.1-0.37+0.1*5.1)/(2.7*5.1-0.37)=1+0.51/(2.7*5.1-0.37)=1+0.51/13.4=1340/1391
37/100再问:还有0.013转换成分数再答:13/1000
53.7*0.37+5.37*6.3=5.37*3.7+5.37*6.3(这步最关键,第一个数缩小十倍,第二个数扩大十倍)=5.37*(3.7+6.3)=5.37*10=53.7
2005×0.375-0.375×1949+0.375×24=0.375×(2005-1949+24)=0.375×80=30
2005年的六级考试风格和自2006年12月开始的不一样,整篇试卷的组成顺序是:PartⅠListeningComprehension(20minutes);PartIIReadingComprehe
0.37*0.37+2*0.63*0.37+0.63*0.63=(0.37*0.37+0.63*0.37)+(0.63*0.37+0.63*0.63)=0.37*(0.37+0.63)+0.63*(0
2005/1*2+2005/2*3+2005/3*4+2005/4*5+~+2005/2004*2005=2005[(1-1/2)+(1/2-1/3)+(1/3-1/4)……+(1/2004-1/20
0.37*201-0.37=0.37*(201-1)=0.37*200=74