tính
A,35 [14-23] - 23 [14-35]
B,27 [13-16] - 16 [13-27]
tính
A,35 [14-23] - 23 [14-35]
B,27 [13-16] - 16 [13-27]
a) 35[14-23]-23[14-35]
=35.(-9)-23.(-21)
=-315-(-483)
=168
b) 27.(13-16)-16.(13-27)
=27.(-3)-16.(-14)
=–81-(–224)
=143
tính hợp lí:
35.(14-23)-23.(14-35)
8154-(674+8154)+(-98+674)
27.(13-16)-16.(13-27)
a, 35.(14-23)-23.(14-35) = 35.14-35.23-23.14-23.35 =14.(35-23) -35.23 - 23.35 = 14.12 = 168
bn nào vừa **** cho mih vậy. thanks nha.!^_^
b, 8154-(674+8154)+(-98+674)
=8154-674-8154-98+674
=(8154-8154)+(-674+674)-98
=0+0-98
=-98
tính hợp lí nhất :
1, 35 . ( 14 - 23 ) - 23 . ( 14 - 35 )
2 , 27 . ( 13 - 16 ) - 16 .( 13 - 27 )
3, 44 . (-36 ) + 22 . ( - 28 )
1.
\(35\times\left(14-23\right)-23\times\left(14-35\right)\)
\(=35\times14-35\times23-23\times14+23\times35\)
\(=\left(23\times35-35\times23\right)+14\times\left(35-23\right)\)
\(=0+14\times12\)
\(=168\)
2.
\(27\times\left(13-16\right)-16\times\left(13-27\right)\)
\(=27\times13-27\times16-16\times13+16\times27\)
\(=13\times\left(27-16\right)+\left(27\times16-16\times27\right)\)
\(=13\times11+0\)
\(=143\)
3.
\(44\times\left(-36\right)+22\times\left(-28\right)\)
\(=22\times2\times\left(-36\right)+22\times\left(-28\right)\)
\(=22\times\left(-72\right)+22\times\left(-28\right)\)
\(=22\times\left[\left(-72\right)+\left(-28\right)\right]\)
\(=22\times\left(-100\right)\)
\(=-2200\)
Chúc bạn học tốt
Tính hợp lí nhất
1. 2155- (174 + 2155) + (-68 + 174)
2. -25 * 72 + 25 * 21 - 49 * 25
3. 35* (14-23) - 23 * (14-35)
4. 8154 - (674 + 8154) + (-98 + 674)
5. -25 * 21 + 25 * 72 + 49 * 25
6. 27* (13 - 16) - 16* (13 - 27)
7.-1911 - ( 1234 - 1911)
8.156 * 72 + 28 *156
9. 32 * (-39) + 16 * (-22)
10. -1945 - ( 567 - 1945 )
11. 184 * 33 + 67 * 184
12. 44 * ( -36 ) + 22 * ( -28)
Mọi người giúp em với
1: Ta có: \(2155-\left(174+2155\right)+\left(-68+174\right)\)
\(=2155-174-2155-68+174\)
=-68
2) Ta có: \(-25\cdot72+25\cdot21-49\cdot25\)
\(=-25\cdot\left(72-21+49\right)\)
\(=-25\cdot100=-2500\)
1. -25.72+25.21-49.25
2. 35( 14 - 23) - 23 (14 - 35)
3. 8154 - (674 + 8154) + (-98 + 674)
4. 25.21 + 25.72 + 49.25
5. 27(13 - 16) - 16(13 - 27)
6. -1911 - (1234 - 1911)
1. -25.72 + 25.21 - 49.25
= 25.(-72) + 25.21 - 49.25
= 25.(-72 + 21 - 49)
= 25. (-100)
= -2500
2. 35(14 - 23) - 23(14 - 35)
= 35. (-9) - 23. (-9)
= -9(35 - 23)
= -9. 12
= -108
3. 8154 -(674 + 8154) + (-98 + 674)
= 8154 - 674 - 8154 + (-98) + 674
= 8154 - 8154 - 674 + 674 + (-98)
= -98
4. 25.21 + 25.72 + 49.25
= 25(21 + 72 + 49)
= 25. 142
= 3550
5. 27(13 - 16) - 16(13 - 27)
= (27.13 - 27.16) - (16.13 - 16.27)
= 27.13 - 27.16 - 16.13 - 16.27
= 27.13 - 16.13 - 27.16 - 16.27
= 27.13 - 16.13
= 13(27 - 16)
= 13.11
= 143
6. -1911 -(1234 - 1911)
= -1911 - 1234 + 1911
= -1911 + 1911 - 1234
= -1234
35.{14-23 } -23.{14-35}
-25.21+25.72+49.25
27.{13-16}-16.{13-27 }
ai nhanh thì mình tick nha
\(\)35.(14-23) - 23.(14-35)
= 35.14 - 35.23 - 23.14 - (-23).35
=[(-35).23 - (-23).35] + 35.14 - 23.14
=[(-35).23 + 23.35] + 14. (35-23)
=[23. (-35+35)] + 14. 12
=[23. 0] + 168
= 0 + 168
= 168
\(\)-25.21 + 25.72 + 49.25
= 25.(-21) + 25.72 + 49.25
= 25. (-21 + 72 + 49)
= 25. 100
= 2500
\(\)27. (13-16) - 16. (13-27)
= 27.13 - 27.16 - 16.13 - (-16).27
= [ -27.16 - (-16).27 ] + 27.13 - 16.13
= [ -27.16 + 16.27 ] + 13. (27-16)
= [ 16. (-27 + 27)] + 13. 11
= [ 16. 0] + 143
= 0 + 143
= 143
Tính hợp lí nhất
1.2155- (174 + 2155) + (-68 + 174)-25.72 + 25.21 - 49.2535.(14 - 23) - 23.(14-358154 - (674 + 8154) + (-98 + 674)-25.21 + 25.72 + 49.2527.(19-16) - 16.(13 - 27)\(a,1.2155-\left(174+2155\right)+\left(-68+174\right)\)
\(=2155-2155-174+174-68\)
\(=-68\)
\(b,-25.72+25.21-49.25\)
\(=25\left(-72+25-49\right)\)
\(=25.\left(-96\right)\)
\(=-2400\)
bài 1
1) -25.72+25.21-49.25
2) 35(14-23)-23(14-35)
3) -25.21+25.72+49.25
4) 27(13-16)-16(13-27)
5) 156.72+28.156
6) 32.(-39)+16.(-22)
làm giùm thằng em tôi cái tôi quên rồi
Tính hợp lí nhất :
1/2155-(174+2155)+(-68+174)
2/-25.72+25.21-49.25
3/35(14-23)-23(14-35)
4/8154-(674+8154)+(-98+674)
5/-25.21+25.72+49.25
6/27(13-16)-16(13-27)
7/-1911-(1234-1911)
8/156.72+28.156
9/32.(-39)+16.(-22)
10/-1945-_567-1945
11/184.33+67.184
a2/44.(-36)+22.(-28)