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3.9+0.1%3.9+0.1用简便方法计算怎么计算?

3.9+0.1-3.9+0.1 =(3.9-3.9)+(0.1+0.1) =0+0.2 =0.2

=3.9-3.9+0.1+0.1=0.2

解: 3.8/3.9+3.9/0.1+0.1/3.9 =38/39+39+1/39 =39+(38/39+1/39) =39+1 =40

1.9+2.9+3.9+0.3 =(1.9+0.1)+(2.9+0.1)+(3.9+0.1) =2+3+4 =9

3.9(1.3x6)=4(1.3X6)-0.1X(1.3X6) =4X7.8-0.78 =31.2-1+0.22 =30.2+0.22 =30.42

【俊狼猎英】团队为您解答 0.3+0.7+1.1+...+9.9 用n表示为 0.4n-0.1,所以 0.4n-0.1=9.9 ,可得n=25,所以这个数列一共25项 0.3+0.7+1.1+...+9.9 =(0.3+9.9)*25/2 =127.5

0.3+1.9+19.9+199.9 =(1.9+0.1)+(19.9+0.1)+(199.9+0.1) =2+20+200 =222 把0.3分成3个0.1

1.27+3.9+0.73+6.1 =1.27+0.73+(3.9+6.1) =2+10 =12

8.55+0.45 =9

0.3×9.9+0.03×1 =0.3×(9.9+0.1) =0.3×10 =3

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