Tìm x -25.21+25.72+49.25?
-25.72+25.21-49.25
-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
-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
fire sky ơi bạn thiếu dấu- đó bạn thank you :)
-25.72+25.21-49.25
\(-25.72+25.21-49.25=25.\left(-72+21-49\right)=25.\left(-100\right)=-2500\)
-25.72+25.21-49.25
-25.72+25.21-49.25
=25.(-72)+25.21-49.25
=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.(72-21+49)
=-25.100=-2500
Các bạn ơi giúp mình với :
1, tính hợp lí
2155-(174+2155)+(-68+174)
-25.21+25.72+49.25
-25.72+25.21-49.25
giúp mình với các bạn ơi
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
vậy ai sai ai đúng
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
tính nhanh:
-25.72+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+21-49)
=25.(-100)
=-2500
= 25.(-72 + 21 - 49)
= 25.(-100)
= -2500
tính hợp lý :-25.72+25.21-49.25
-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
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)\(a,1.2155-\left(174+2155\right)+\left(-68+174\right)\)
\(=2155-2155-174+174-68\)
\(=-68\)
\(b,-25.72+25.21-49.25\)
\(=25\left(-72+25-49\right)\)
\(=25.\left(-96\right)\)
\(=-2400\)