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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)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) (-49).(100-1)=(-49).100+49=-4900+49=-4851
b) (-52).(-101)= (-52).{(-100)-1}=(-52).(-100)-(-52)=5200+52=5252
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\(15.14.12.25.2=15.14.\left(4.3\right).25.2\)
\(=15.2.25.4.14.3=30.100.42\)
\(=3000.42=126000\)
#Hok_tốt
\(15\cdot14\cdot12\cdot25\cdot2\)
\(=3\cdot5\cdot2\cdot7\cdot3\cdot4\cdot25\cdot2\)
\(=\left(3\cdot3\right)\cdot\left(5\cdot2\right)\cdot\left(4\cdot25\right)\cdot2\cdot7\)
\(=9\cdot10\cdot100\cdot2\cdot7\)
\(=9000\cdot2\cdot7\)
\(=18000\cdot7\)
\(=126000\)
![](https://rs.olm.vn/images/avt/0.png?1311)
-37+54+(-70)+(-163)+245=29
(-69)+54+46+(-94)+(-14)+78=1
mk nha :)
2.19.6 + 3.37.4+44.12=12.19+12.37+44.12=12(19+37+44)=12.100=1200
2.19.6+3.37.4+44.12
=2.6.19+3.4.37+12.44
=12.19+12.37+12.44
=12.(19+37+44)
=12.100
=1200