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a) 135 x (20 + 3)
= 135 x 20 + 135 x 3
= 2700 + 405 = 3105
427 x (10 + 8)
= 427 x 10 + 427 x 8
= 4270 + 3416 = 7686
b) 642 x (30 -6)
= 642 x 30 - 642 x 6
= 19260 - 3852 = 15408
287 x (40 -8)
= 287 x 40 - 287 x 8
= 11480 - 2296 = 9184
![](https://rs.olm.vn/images/avt/0.png?1311)
135 x ( 20 + 3 ) = 135 x 23 = 3105
427 x ( 10 + 8 ) = 427 x 18 = 7686
642 x ( 30 - 6 ) = 642 x 24 = 15408
287 x ( 40 - 8 ) = 287 x 32 = 9184
![](https://rs.olm.vn/images/avt/0.png?1311)
135 x (20 + 3)
= 135 x 20 + 135 x 3
= 2700 + 405
= 3105.
427 x (10 + 8)
= 427 x 10 + 427 x 8
= 4270 + 3416
= 7686.
642 x (30 - 6)
= 642 x 30 - 642 x 6
= 19260 - 1452
= 18808.
287 x (40 - 8)
= 287 x 40 - 287 x 8
= 11480 - 2296
= 9184.
135x(20+3) 642 x (30-6)
= 135 x 20 + 135 x 3 = 642 x 30 - 642 x 6
= 2700+405 = 19 260 - 3852
= 3105 =15 408
427 x ( 10+8) 287 x (40 - 8)
= 427 x 10 + 427 x 8 = 287 x 40 - 287 x 8
= 4270 + 3416 =11 480 - 2296
=7686 = 9184
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bằng 19260 nha bạn
T.I.C.K cho mình nha
Chúc bạn hok tốt
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a. 523 – x = 301
x = 523 – 301
x = 222
b. x : 642 = 6
x = 642 x 6
x = 3 852
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(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
![](https://rs.olm.vn/images/avt/0.png?1311)
135x(20+3)=3105
427x(10+8)=7686
642x(30-8)=15408
287x(40-8)=9184
a)135 x (20+3)=3105 b)642 x (30 - 6)=15408
427 x (10+8)=7650 287 x (40 - 8)=9184
![](https://rs.olm.vn/images/avt/0.png?1311)
642 x (30 -6)
= 642 x 30 - 642 x 6
= 19260 - 3852 = 15408