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Câu A là :2x19x6+3x37x4+44x12=228+444+528=1200
Câu B là:18x15+35+15x32+35x49=270+35+480+1715=(1715+35)+(270+480)=1750+750=1500
2.19.6 + 3.37.4 + 44.12
= 12 .19 + 12.37 + 44.12
= 12.(19+37+44)
= 12.100 = 1200
![](https://rs.olm.vn/images/avt/0.png?1311)
2.9.6+3.37.4+44.12
=2.6.9+3.4.37+44.12
=12.9+12.37+44.12
=12. (9+37+44)
=12.90
=1080
2.9.6+3.37.4+44.12
=2.3.3.3.2+3.37.4+44.4.3
=4.3.3.3+3.4.37+44.3.4
=3.4.(3.3+37+44)
=12.80
=960
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{3.7.11}{44.12}=\frac{3.7.11}{4.11.3.4}=\frac{7}{4.4}=\frac{7}{16}\)
\(\frac{22+77}{7.5.11}=\frac{99}{7.5.11}=\frac{9.11}{7.5.11}=\frac{9}{35}\)
\(\frac{3.7.11}{44.12}=\frac{3.7.11}{11.4.3.4}=\frac{7}{4^2}\)
\(\frac{22+77}{7.5.11}=\frac{11\left(2+7\right)}{35.11}\frac{9}{35}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Sửa đề: 8666
8666*15+170*4333
=4333*(2*15+170)
=200*4333
=866600
![](https://rs.olm.vn/images/avt/0.png?1311)
A = 44 . 82 -22 + 18 . 44
= 44 . 82 - 4 + 18 . 44
= 44. ( 82 + 18 ) - 4
= 44 . 100 - 4
= 4400 - 4
= 4396
Ta có: \(A=44\cdot82-2^2+18\cdot44\)
\(=44\cdot\left(82+18\right)-4\)
\(=44\cdot100-4\)
\(=4400-4=4396\)
![](https://rs.olm.vn/images/avt/0.png?1311)
13: \(\left(-15\right)+8+7\)
\(=\left(-15\right)+\left(8+7\right)\)
=-15+15
=0
14: \(\left(-8\right)+2+6\)
\(=\left(-8\right)+\left(2+6\right)\)
=-8+8
=0
15: \(\left(-1\right)+3-2\)
\(=\left(-1-2\right)+3\)
=-3+3
=0
16: \(25-8-7\)
\(=25-\left(8+7\right)\)
=25-15
=10
17: \(8-2-6\)
\(=8-\left(2+6\right)\)
=8-8
=0
18: \(\left(-12\right)-3+15\)
\(=\left(-12-3\right)+15\)
=-15+15
=0
![](https://rs.olm.vn/images/avt/0.png?1311)
Đáp số: 1200