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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