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a. 4125:15-405:15
=(4125-405):15
=3720:15
=248.
b. 25x5x4x3
= 25x4x5x3
= 100x15
=1500.
c. 236x20-36x20
=(236-36)x20
= 200x20
=4000.
d) 785x214+215x214
= (785+215)x214
= 1000x214
=214000
A) 4125 : 15 - 405 : 15
= ( 4125 - 405 ) : 15 = 3720 : 15 = 248
B) 25 x 5 x 4 x 3
= ( 25 x 4 ) x ( 5 x 3 ) = 100 x 15 = 1500
C) 236 x 20 - 36 x 20
= ( 236 - 36 ) x 20 = 200 x 20 = 4000
D) 785 x 214 + 215 x 214
= ( 785 + 215 ) x 214 = 1000 x 214 = 214 000
Chúc bạn học tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.4125:15-405:15=\left(4125-405\right):15\)
\(=3720:15=248\)
\(b.25\times5\times4\times3=\left(25\times4\right)\times\left(5\times3\right)\)
\(=100\times15=1500\)
\(c.236\times20-36\times20=\left(236-36\right)\times20\)
\(=200\times20=4000\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(1.\) 12 x 11 + 21 x 11 x 11 + 11 x 33
= ( 12 x 11 ) + ( 21 x 11 x 11 ) + ( 11 x 33 )
= \(132+2541+363\)
= \(3036\)
132x11-11x32-54x11
= ( 132 x 11 ) - ( 11 x 32 ) - ( 54 x 11 )
\(=1452-352-594\)
= \(506\)
\(2.\)
45 x 32 + 1245
= ( 45 x 32 ) + 1245
= 1400 + 1245
= 2685
75 x 18 + 75 x 21
= ( 75 x 18 ) + ( 75 x 21 )
= 1350 + 1575
= 2925
12 x (27+46) -1567
= 12 x 73 - 1567
= ( 12 x 73 ) - 1567
= 876 - 1567
= - 691
![](https://rs.olm.vn/images/avt/0.png?1311)
1282+2005-3546+4218-454+995
=(1282+4218)+(2005+995)-(3456+454)
=5500+3000-4000
=4500
1282+2005-3546+4218-454+995
=(1282+4218)+(2005+995)-(3456+454)
=5500+3000-4000
=4500
![](https://rs.olm.vn/images/avt/0.png?1311)
(3214 x 42 - 27 x 3214 - 642 : 3 x15) :300
=(3214 x (42 - 27) - 642 : 3 x 15) : 300
=(3214 x 15 - 214 x 15) : 300
=(3214 - 214) x 15 : 300
=3000 x 15 :300
= 45000: 300=150
a ) 4125 : 15 - 405 : 15
= ( 4125 - 405 ) : 15
= 3720 : 15
= 248
135 x 345 + 675 : 135
= 46575 + 5
= 46580
62385+237 x 165
= 62385 + 39105
= 101490
b )25 x 5 x 4 x 3
= ( 25 x 3 ) x ( 5x 4 )
= 75 x 20
= 1500
15400 : 25 : 4
= 15400 : ( 25 x 4 )
= 15400 : 100
= 154
132039 - 1234 x 107
= 132039 - 132038
= 1
c ) 236 x 20 - 36 x 20
= ( 236 - 36 ) x 20
= 200 x 20
= 4000
1224 : 24 + 1416 : 24
= ( 1224 + 1416 ) : 24
= 2640 : 24
= 110
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