Tính nhanh
e) 215 + 43 + ( -25 ) + ( -25 )
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e) 215 + 43 + ( -215 ) + ( -25 )
=[215+(-215)] + [43+ (-25) ]
=0+18=18
e)215 + 43 + (-215) + (-25)
=[215 + (-215)] + [43 + (-25)]
=0 + 18
=18
215 + 43 + ( -215 ) + ( -25 )
= [ 215 + (-215)] + [43 + (-25)]
= 0 + 18
= 18
a)2354-45-2345=2354-2354-45=-45. b)-2009-243+2009=-2009+2009-234+-243. c)16+23+153-16-23=16-16+23-23+153=153.d)134-167+45-134-45=134-134+45-45-167=-167.e)215+43-215-25=215-215+43-25=18.f)-312-327-28+27-312-28-327+27=340-300=40
a, (2354-45)-2354
=2354-45-2354
=(2354-2354)-45
=0-45
=-45
a) 36 x 25 x 4 = 36 x ( 25 x 4) = 36 x 100 = 3600
18 x 24 : 9= 24 x ( 18:9) = 24 x 2 = 48
41 x 2 x 8 x 5= 41 x 8 x ( 5x2) = 41 x 8 x 10 = 3280
b) 108 x (23 + 7)= 108 x 30 = 3240
215 x 86 + 215 x 14 = 215 x ( 86 + 14) = 215 x 100 = 21500
53 x 128 – 43 x 128= 128 x ( 53 - 43) = 128 x 10 = 1280
1. 36 x 25 x 4
= 36 x 100
= 3600
2. 18 x 24 : 9
= 18 : 9 x 24
= 2 x 24
= 48
3. 41 x 2 x 8 x 5
= 41 x 8 x 10
= 328 x 10
= 3280
4. 108 x (23+7)
= 108 x 30
= 3240
5. 215 x 86 + 215 x 14
= 215 x (86+14)
= 215 x 100
= 21500
6. 53 x 128 - 43 x 128
= (53-43) x 128
= 10 x 128
= 1280
ok men
a, (2354 - 45) - 2354
= 2354 - 45 - 2354 = ( 2354 - 2354 ) - 45 = 0 - 45 = -45
b, (-2009 ) - ( 234 - 2009 )
= (-2009 ) - 234 + 2009 = ( -2009 + 2009 ) -234 = 0- 234 = -234
c, ( 16 + 23 ) + ( 153 - 16 - 23 )
= 16 + 23 + 153 - 16 - 23 = ( 16 - 16 ) + ( 23 - 23 ) + 153 = 0 + ) + 153 = 153
d, (134- 167 + 45 ) - ( 134 + 45 )
= 134 - 167 + 45 - 134 - 45
= ( 134 - 134 ) + ( 45 - 45 ) - 167 = 0 - 0 - 167 = -167
e, 215 + 43 - 215 - 25
= ( 215 - 215 ) + ( 43 - 25 ) = 0 + 18 = 18
f, (-312)- 327 - 28+ 27
= ( -312 - 327 ) - ( 28 - 27 )
= -639 - 1
= -640
a) (2354-45)-2354=2354-45-2354=-45
b) (-2009)-(234-2009)=-2009-234+2009=-234
c) (16+23)+(153-16-23)=16+23+153-16-23=153
d) (134-167+45)-(134+45)=134-167+45-134-45=-167
e) 215+43+(-215)+(-25)=215+43-215-25=18
f) (-312)+(-327)+(-28)+27=-312-327-28+27=-640
9900 : 36 - 15 x 11
= 275 - 165
= 110
9700 : 100 + 36 x 12
= 97 + 432
= 529
( 15792 : 336 ) x 5 + 27 x 11
= 47 x 5 + 297
= 235 + 297
= 532
( 160 x 5 - 25 x 4 ) : 4
= ( 800 - 100 ) : 4
= 700 : 4
= 175
1036 + 64 x 52 - 1827
= 1036 + 3328 - 1827
= 4364 - 1827
= 2537
215 . 869 + 215 . 14
= 215 . ( 869 + 14 )
= 215 . 883
= 189945
= ( 215 + 43 ) - 25
= 258 - 25
= 233
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