2155-(174+2155)+(-68+174)

=2155-174-2155-68+174

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

=-68

-25.21+25.72+49.25

=25.(-21+72+49)

=25.100

=2500

-25.72+25.21-49.25

=25.(-72+21-49)

=25.(-100)

=-2500

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

-25.21+25.72+49.25=25(-21+72+49)=25(51+49)=25.100=2500

-25.72+25.21-49.25=-25(72-21+49)=-25.100=-2500

-25.72+25.21-49.25

=25.(-1).72+25.21-49.25

=25.(-72)+25.21-49.25

=25.(-72+21-49)

=25.(-100)

=-2500

-25.72 + 25.21 - 49.25 = 25.(-72) + 25.21 - 49.25 = 25.(-72 + 21 - 49) = 25.(-100) = -2500

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

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

\(=-68\)

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

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

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

\(=-2400\)

-25 . 72 + 25 . 21 - 49 . 25

= -1800 + 525 - 1225

= -1275 - 1225

= -2500

-25.72+25.21-49.25=25.(-72+21-49)=25.(-100)=-2500

-25,72+25,21-49,25

=-0,54-49.25

=-49,79.

Đó bn

-25.72 + 25.21 - 49.25

= 25 x (-72 + 21 - 49)

= 25 x (-100)

= -2500

\(-25.72+25.21-49.25=25.\left(-72+21-49\right)=25.\left(-100\right)=-2500\)

-25.72+25.21-49.25

=25.(-72)+25.21-49.25

=25.(-72+25-49)

=25.(-96)

=-2400

\(-25.72+25.21-49.25\)

\(=-72\cdot25+25\cdot21-49\cdot25\)

\(=25\left(-72+21-49\right)\)

\(=25.\left(-100\right)\)

\(=-2500\)

\(-25,21+25,72+49,25=49,76\)

Ủng hộ mk nka!^_^

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