脫式計算,能簡算的要簡算21

2021-03-17 01:48:29 字數 1979 閱讀 1867

1樓:康昕昕

(1)21÷0.25÷0.4

=21÷(0.25×0.4)

=21÷0.1

=210;

(2)3.5×0.7+5.5×0.7+0.7=(3.5+5.5+1)×0.7

=10×0.7

=7;(3)0.125×3.2×0.25

=(0.125×8)×(0.4×0.25)=1×0.1

=0.1;

(4)1.25×3.2×0.8

=1.25×0.8×3.2

=1×3.2

=3.2.

脫式計算,能簡算的要簡算.21÷0.25÷0.43.5×0.7+5.5×0.7+0.7

2樓:汪天韻

(1)21÷0.25÷0.4,

=21÷(0.25×0.4),

=21÷0.1,

=210;版

(2)3.5×0.7+5.5×0.7+0.7,=(3.5+5.5+1)×權0.7,

=10×0.7,

=7;(3)0.125×3.2×0.25,=0.125×8×0.4×0.25,

=(0.125×8)×(0.4×0.25),=1×0.1,

=0.1;

(4)0.2×9.9+0.1,

=0.2×(10-0.1)+0.1,

=0.2×10-0.2×0.1+0.1,

=2+0.1-0.02,

=2.1-0.02,

=2.08.

7.2÷0.25÷0.4脫式計算,能簡算的要簡算

3樓:瀛洲煙雨

7.2÷0.25÷0.4

=7.2÷(0.25×0.4)

=7.2÷0.1=72

4樓:辛新土

7.2/0.25/0.4

=7.2/(0.25x0.4)

=7.2/0.1

=72如有幫助請採納,

如對本題有疑問可追問,good luck!

5樓:數學愛好者

巧算過程bai解析7.2÷0.25÷0.

4解題du思路:四則運算規則zhi(按順序計算,先算乘dao除後算加減,有括號版先算括號,有乘方權先算乘方)即脫式運算(遞等式計算)需在該原則前提下進行

解題過程:

7.2÷0.25÷0.4

=7.2÷(0.25×0.4)

=7.2÷0.1

=72擴充套件資料[豎式計算-計算過程]:先將兩乘數末位對齊,然後分別使用第二個乘數,由末位起對每一位數依次乘上一個乘數,最後將所計算結果累加即為乘積,如果乘數為小數可先將其擴大相應的倍數,最後乘積在縮小相應的倍數;

解題過程:

步驟一:5×4=20

步驟二:2×4=80

根據以上計算步驟組合結果為0.1

存疑請追問,滿意請採納

脫式計算(能簡算的要簡算)4.36×12.5×8;15.2÷0.25÷4;0.

6樓:胤胤胤

(bai1)4.36×du12.5×8

=4.36×(12.5×8)

=4.36×100

=436;

(zhi2)15.2÷dao0.25÷4

=15.2÷(

0.25×4)

=15.2÷1

=15.2;

(3)0.46×1.9+0.54×1.9

=(0.46+0.54)×

內1.9

=1×1.9

=1.9;

(4)3.6÷[(1.2-0.4)×0.5]=3.6÷[0.8×0.5]

=3.6÷0.4

=9.容

7樓:匿名使用者

先算12.5*8=100*4.36=436

15.2/0.25/4=15.2*(0.25*4)=12.5

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