Tính hợp lí nhất
2155- (174 + 2155) + (-68 + 174)
-25 . 72 + 25 . 21 – 49 . 25
7, – 326 – ( 115 – 326)
36.82 + 18.36
34.( -84) + 17.(-32)
– 1911 – (1234 – 1911)
, 156.72 + 28.156
32.( -39) + 16.(-22)
– 1945 – ( 567- 1945)
184.33 + 67.184
44.( -36) + 22.(-28)
, – 1965 – ( 628 – 1965)
172.27 + 73.172
66.( -55) + 33.(-90)
-25 . 72 + 25 . 21 – 49 . 25
mn giúp vs ạ gấp lắm
`155- (174 + 2155) + (-68 + 174)`
`=2155-174-2155-68+174`
`=(2155-2155)+(-174+174)-68`
`=0+0-68`
`=-68`
`-25 . 72 + 25 . 21 – 49 . 25`
`=25.21-25.72-25.49“
`=25.(21-49-72)`
`=25.-100`
`=-2500`
`- 326 – ( 115 – 326)`
`= -326 – 115 + 326`
` =(-326 + 326) – 115`
`= 0 – 115`
`36.82 + 18.36`
`= 36. (82+18)`
`= 36. 100`
`= 3600`
`34 . (-84) + 17 . (-32)`
`= 34 . (-84) + 17 . [2 . (-16)]`
`= 34 . (-84) + (17 . 2) . (-16)`
`= 34 . (-84) + 34 . (-16)`
`= 34 . (-84 – 16)`
`= 34 . (-100)`
`= -3400`
`- 1911 – (1234 – 1911)`
`= -1911+1911-1234`
`= 0-1234`
`= -1234`
`156.72 + 28.156`
`= 156.(72+28)`
`= 156.100`
`= 15600`
`32.(-39) + 16.(-22)`
`= 2.16.(-39)+ 16.(-22)`
`= 16.(-78)+ 16.(-22)`
`=16.[(-78)+(-22)]`
`=16.(-100)`
`= -1600`
`- 1945 – ( 567- 1945)`
`=-1945-567+1945`
`=(-1945+1945)-567`
`=0-567`
`=0+(-567)`
`=-567`
`184.33 + 67.184`
`=184.(33+67)`
`=184.100`
`=18400`
`44.( -36) + 22.(-28)`
`=22.2.(-36)+22.(-28)`
`=22.(-76)+22.(-28)`
=22.[(-76)+(-28)]`
`=22.(-100)`
`=-2200`
`- 1965 – ( 628 – 1965)`
`= -1965 – 628 + 1965“
`= -2593 + 1965`
`= -628`
`172.27 + 73.172`
`= 172. (27+73)`
`= 172. 100`
`= 17200`
`-25 . 72 + 25 . 21 – 49 . 25`
`=25.21-25.72-25.49`
`=25.(21-49-72)`
`=25.-100`
`=-2500`
@Mon lì
CHO MIK XIN CTLHN Ạ
2155- (174 + 2155) + (-68 + 174)
= 2155 – 174 – 2155 – 68 + 174
= (2155 – 2155) – (174 – 174) – 68
= 0 – 0 – 68
= -68
-25 . 72 + 25 . 21 – 49 . 25
= 25 . (-72 + 21 – 49)
= 25 . (-100)
= -2500
– 326 – ( 115 – 326)
= -326 – 115 + 326
= -326 + 326 – 115
= 0 – 115
= -115
36.82 + 18.36
= 36 . (82 + 18)
= 36 . 100
= 3600
34.( -84) + 17.(-32)
= -2856 – 544
= -3400
– 1911 – (1234 – 1911)
= -1911 – 1234 + 1911
= -1911 + 1911 – 1234
= 0 – 1234
= -1234
156.72 + 28.156
= 156 . (72 + 28)
= 156 . 100
= 15600
32.( -39) + 16.(-22)
= -1248 – 352
= -1600
– 1945 – ( 567- 1945)
= -1945 – 567 + 1945
= -1945 + 1945 – 567
= 0 – 567
= -567
184.33 + 67.184
= 184 . (33 + 67)
= 184 . 100
= 18400
44.( -36) + 22.(-28)
= -1584 – 616
= -2200
– 1965 – ( 628 – 1965)
= -1965 – 628 + 1965
= -1965 + 1965 – 628
= 0 – 628
= -628
172.27 + 73.172
= 172 . (27 + 73)
= 172 . 100
= 17200
66.( -55) + 33.(-90)
= -3630 – 2970
= -6600
-25 . 72 + 25 . 21 – 49 . 25
= 25 . (-72 + 21 – 49)
= 25 . (-100)
= -2500