A.168

B.143

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

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bn nào vừa **** cho mih vậy. thanks nha.!^_^

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

bạn có thể giải thích rõ ràng hơn không

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

= 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)

= 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

\(a,1.2155-\left(174+2155\right)+\left(-68+174\right)\)

\(=2155-2155-174+174-68\)

\(=-68\)

\(b,-25.72+25.21-49.25\)

\(=25\left(-72+25-49\right)\)

\(=25.\left(-96\right)\)

\(=-2400\)