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21/(4.8一0.5)用简便方法计算

21.5÷(4.8-0.5) =21.5÷4.3 =21.5×2÷4.3÷2 =43÷4.3÷2 =10÷2 =5

0.5乘以9.68乘以0.25 =0.5×2×4.84×0.25 =1×1.21×4×0.25 =1.21×1 =1.21

(60-28.21-11.79)×0.5 =〔60-(28.21+11.79)〕×0.5 =〔60-40〕×0.5 =20×0.5 =10 本题已解答,满意 请点击采纳答案

您好: 4.5+5.5*0.42 =4.5+5.5x2x0.21 =4.5+11x0.21 =4.5+0.21x10+0.21x1 =4.5+2.1+0.21 =6.81 如果本题有什么不明白可以追问,如果满意记得采纳 如果有其他问题请另发或点击向我求助,答题不易,请谅解,谢谢。 请点击下面的【选为满意回答】按...

0.8乘[15.5减(3.21加5.79)] = 0.8乘[15.5减9] = 0.8乘6.5 = 0.8乘6+0.8乘0.5 = 4.8+0.4 = 5.2

4.5x2.1-5×0.21 =4.5x2.1-0.5×2.1 =(4.5-0.5)x2.1 =4x2.1 =8.4 希望帮到你 望采纳 谢谢 加油~

8.4÷0.21÷0.5 各个数扩大100倍 即840/21/50=40/50=0.8 因为是扩大一百倍 所以0.8*100=80

(1)21÷0.25÷4=21÷(0.25×4)=21÷1=21(2)3.5×0.7+5.5×0.7+0.7=(3.5+5.5+1)×0.7=10×0.7=7(3)0.23×102=0.23×(100+2)=0.23×100+0.23×2=23+0.46=23.46(4)0.125×3.2×0.25 =(0.125×8)×(0.4×0.25)=1×0.1=0.1(5)64×4.5+3.6×45=64×4.5+3...

【1】一、用心思考,我会填。(20分) 1、5.04×2.1的积是( )位小数;22.6÷0.33的商,保留一位小数约是( )。 2、将 保留两位小数是( ),...

8/21*(1 3/4)2次方-(0.5-1) 解: 8/21*(1-3/4)2次方-(0.5-1) =8/21*1/16+0.5 =1/42+1/2 =22/42 =11/21

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