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![](https://rs.olm.vn/images/avt/0.png?1311)
a, a= 800,04
a - 68,031: 0,09 = 800,04 - 755,9 = 44,14
b, a= 996,54
a - 68,031 : 0,09 = 996,54 - 755,9 = 240,64
![](https://rs.olm.vn/images/avt/0.png?1311)
a = 51 x 48 = 51 x ( 45 + 3 ) = 51 x 45 + 51 x 3
b = 54 x45 = (51 + 3 ) x 45 = 51 x45 + 3 x 45
ta thấy: 3 x 51 > 3 x 45 nên a > b
Ta có: A=51x48=51x(45+3) = 51x45+3x51
B= 54x45=(51+3)x45=51x45+3x45
Ta thấy 51x3>45x3 => 51x45+3x51>51x45+3x45 hay A>B
![](https://rs.olm.vn/images/avt/0.png?1311)
4,25 x 57,43 - 325 + 42,75 x 4,25
= 4,25 x 57,43 + 42,75 x 4,25 - 325
= 4,25 x ( 57,43 + 42,75 ) - 325
= 4,25 x 100,18 - 325
= 425,765 - 325
= 100,765
~ Hok T ~
4,25 x 57,43 - 325 + 42.75 x 5,25
=244,0775 - 325 + 181,6875
=-80,9225 + 181,6875
=100.765
chúc bạn học tốt 😎
![](https://rs.olm.vn/images/avt/0.png?1311)
A=29 1/2 * 2/3 +39 1/3 * 3/4 + 5/6
A=29 1/2 * 39 1/3 * (2/3 + 3/4 + 5/6)
A=29 1/2 * 39 1/3 * (1/2 + 5/6)
A=29 1/2 * 39 1/3 * 4/3
A=29 1/2 * 52
A=1534
Dấu * là dấu nhân nha !!!
Còn bài 2 mình ko biết
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,14,7\times4+52,8+14,7\times6+47,2\)
\(=14,7\left(4+6\right)+\left(52,8+47,2\right)\)
\(=147+100\)
\(=247\)
\(b,\left(675,75:25+2255:11\right)-216,8\)
\(=\left(27,03+205\right)-216,8\)
\(=232,03-216,8\)
\(=15,23\)
hok tốt!
a,14,7×4+52,8+14,7×6+47,2 b,(675,75:25+2255:11)−216,8
=14,7(4+6)+(52,8+47,2) =(27,03+205)−216,8
=147+100 =232,03−216,8
=247 =15,23
hok tốt!
kb nha
![](https://rs.olm.vn/images/avt/0.png?1311)
a/\(1248:12-2,5\times4+6,03.\)
\(=104-10+6,03\)
\(=94+6,03=100,03\)
b/\(\left(\frac{2}{3}+\frac{5}{7}-\frac{1}{3}\right)\times\frac{7}{11}+3\frac{1}{3}.\)
\(=\left(\frac{29}{21}-\frac{1}{3}\right)\times\frac{7}{11}+3\frac{1}{3}\)
\(=\frac{22}{11}\times\frac{7}{11}+3\frac{1}{3}\)
\(=\frac{2}{3}+3\frac{1}{3}\)
\(=\frac{2}{3}+\frac{10}{3}\)
\(=\frac{12}{3}=4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
0,35 × 135 - 35% × 35
= 0,35 × 135 - 0,35 × 35
= 0,35 × (135 - 35)
= 0,35 × 100
= 35
\(0,35\times135-35\%\times35\)
\(=0,35\times135-0,35\times35\)
\(=0,35\times\left(135-35\right)\)
\(=0,35\times100\)
\(=35\)
Đáp án :
a) 44,14
b)240,64
A,44,14
B,260,64
chúc bạn học tốt :)