(252+2×28-5×28):28
5×7×77-7×60+49×25-15×42
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5 x 7 x 77 - 7 x 60 +49 x 25 -15 x 42.
=5 x 7 x 77 - 7 x 5 x 12 +49 x 5 x 5 - 5 x 3 x 42.
=5 x 539 - 84 x 5 +245 x 5 -5 x 126
=5 x (539 - 84 +245 -126)
=5 x 574 =2870
c) 5 . 7 . 77 - 7 . 60 + 49 . 25 - 15 . 42
=5.7.77-7.5.12+7.7.5.5-3.5.7.6
=5.7.(77-12+5.7-3.6)
=35.82=2870
5x7x77-7x60+49x25-15x42
=5x7x77-7x5x12+7x7x5x5-5x3x7x6
=35x77-35x12+35x35-35x18
= 35x (77-12+35-18)
=35x82
=2870
5 x 7 x 77 - 7 x 60 + 49 x 25 - 15 x 42
= 7 x 77 x 5 - 7 x 60 + 7 x 7 x 25 - 15 x 6 x 7
= 7 x 385 - 7 x 60 + 7 x 35 - 7 x 90
= 7 x ( 385 - 60 + 35 - 90 )
= 7 x 270
= 1890
a, 53 * 39 + 47 * 59 - 53 * 21 - 47 * 21 c, (43 * 52 - 43 ) : ( 4 * 42 )
= ( 53 + 47 ) * 39 - ( 53 + 47 ) * 21 = ( 64 * 25 - 64 ) : ( 4 * 16 )
= 100 * 39 - 100 * 21 = ( 1600 - 64 ) : 64
= ( 39 - 21 ) * 100 = 1536 : 64
= 18 * 100 = 24
= 1800
5.7.77-7.60+49.25-15.42
= 5.7.77-7.5.12+7.7.5.5-3.5-3.5.6.7
= 35.77-35.12+35.35-35.18
= 35.(77-12+35-18)
= 35.82
= 2870
53x39+47x39-53x21-47x21
=39x ( 53+47) - 21x(53+47)
=39 x100 - 21x100
= 100x(39-21)
=100x18
=1800
2x53x12 +4x6x87 - 3x8x40
= (2x12)x53 + (4x16)x87 - (3x8) x40
= 24x53 + 24x87 + 24x40
= 24( 53+87+40)
= 24x180
=4320
`(252 + 2` x `28 - 5` x `28) : 28`
`= (9` x `28 + 2` x `28 - 5` x `28) : 28`
`= (9 + 2- 5)` x `28 : 28`
`= 6` x `1`
`= 6`
`5` x `7` x `77 - 7` x `60 + 49` x `25 - 15` x `42`
`= 5` x `7` x `77 - 7` x `60 + 7` x `7` x `25 - 15` x `6` x `7`
`= 385` x `7 - 7` x `60 + 7` x `175 - 90` x `7`
`= 7` x `(385 - 60 + 175 - 90)`
`= 7` x `410`
`= 7` x `(400 + 10)`
`= 7` x `400 + 7` x `10`
`= 2800 + 70 `
`= 2870`
(252 + 2 x 28 - 5 x 28) : 28
= (9 x 28+ 2 x 28 - 5 x 28) : 28
= (9 + 2 - 5) x 28 : 28
= (11 - 5) x (28 : 28)
= 6 x 1
= 6