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![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(60-26,75-13,25\)
\(=60-\left(26,75+13,25\right)\)
\(=60-40=20\)
b: \(38,25-18,25+21,64-11,64+9,93\)
\(=\left(38,25-18,25\right)+\left(21,64-11,64\right)+9,93\)
\(=20+10+9,93=39,93\)
c: \(45,28+52,17-15,28-12,17\)
\(=\left(45,28-15,28\right)+\left(52,17-12,17\right)\)
=30+40
=70
d: \(\left(72,69+18,47\right)-\left(8,47+22,69\right)\)
\(=72,69+18,47-8,47-22,69\)
\(=\left(72,69-22,69\right)+\left(18,47-8,47\right)\)
=50+10
=60
![](https://rs.olm.vn/images/avt/0.png?1311)
45,28 + 52,17 - 15,28 - 12,17
= ( 45,28-15,28 ) + ( 52,17 - 12,17 )
= 30 + 40 = 70
72,9 * 99 + 72 + 0,9
= 72,9 *99 + ( 72+0,9 )
= 72,9* 99 + 72,9
=72,9 * ( 99 + 1 )
= 72,9 * 100 = 7290
38,25-18,25+21,64-11,64+9,93
= 20 + 10 + 9,93
= 30 + 9,93 = 39,93
(72,69+18,47)-(8,47+22,69)
= 72,69 + 18,47 - 8,47 + 22,69
= ( 72,69 - 22,69 ) + ( 18,47 - 8 ,47 )
= 50 + 10 = 60
(42,8*6,9-154,56):34,5
= 140,76 : 34,5 = 4,08
![](https://rs.olm.vn/images/avt/0.png?1311)
a)15,27-4,18-2,09
=15,27-(4,18+2,09)
=15,27-6,27
=9
b)60-26,75-13,25
=60-(26,75+13,25)
=60-40
=20
c)38,25-18,25+21,64-11,64+9,93
=(38,25-18,25)+(21,64-11,64)+9,93
=20+10+9,93
=39,93
d)45+52,17-15,28-12,17
=45+(52,17-12,17)-15,28
=45+40-15,28
=69,72
e)(72,69+18,47)-(8,47+22,69)
=72,69+18,47-8,48-22,69
=(72,69-22,69)+(18,47-8,47)
=50+10
=60
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(15,27-4,18-2,09\)
\(=11,09-2,09\)
\(=9\)
b) \(60-26,75-13,25\)
\(=60-\left(26,75+13,25\right)\)
\(=60-40\)
\(=20\)
c) \(38,25-18,25+21,64-11,64+9,93\)
\(=\left(38,25-18,25\right)+\left(21,64-11,64\right)+9,93\)
\(=20+10+9,93\)
\(=30+9,93\)
\(=39,93\)
e) \(\left(72,69+18,47\right)-\left(8,47+22,69\right)\)
\(=72,69+18,47-8,47-22,69\)
\(=\left(72,69-22,69\right)+\left(18,47-8,47\right)\)
\(=50+10\)
\(=60\)
Chiều dài của hình chữ nhật là:
\(36\div\dfrac{3}{5}=60\left(cm\right)\)
Sợi dây thép đso dài số mét là:
\(\left(60+36\right)\times2=192\left(cm\right)\)
Đổi: \(192cm=1,92m\)
Đáp số: \(1,92m\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Tính bằng cách thuận tiện:
a) 15,27 - 4,18 - 2,09 = (15,27 - 4,18) - 2,09
= 13,09 - 2,09
= 11
b) 60 - 26,75 - 13,25 = 60 - (26,75 + 13,25)
= 60 - 40
= 20
c) [72,69 + 18,47] - [8,47 + 22,69] = 72,69 + 18,47 - 8,47 - 22,69
= (72,69 - 22,69) + (18,47 - 8,47)
= 50 + 10
Chúc học tốt!
![](https://rs.olm.vn/images/avt/0.png?1311)
A, 15,27 - 4,18 - 2,09 = 15,27 - ( 4,18 + 2,09 )
= 15,27 - 6,27
= 9
B,
60-26,75-13,25=60-(26,75+13,25)=60-40=20
C,38,25-18,25+21,64-11,64+9,93=20+10+9,93=39,93
e,(72,69+18,47)-(8,47+22,69)=72,69+18,47-8,47-22,69=72,69-22,69+18,47-8,47=50+10=60
(72,69+18,47)-(8,47+22,69)=(72,69-22,69)+(18,47-8,47)
= 50 +10
=60
(72,69+18,47) - ( 8,47 + 22,69)
= ( 72,69 - 22,69) + ( 18,47 - 8, 47 )
= 50 +10
=60