X+(2750-135x200):5=53x128+69x128-22x128
Tính hợp lí:
1) 173-(36+173)+[(175-27)-175-(-36+50)]
2) -[-171+(171+23)]-[172-(38+172)]-49
3) 2750-(2085+2750)-[-438-(29-438)]
4/ -482-(176-48)-[2750-(176+2750)]
5/ -382-[1925+(-382)]-[(3210-697)+(-3210+597)]
Giúp mik vs mik đag cần gấp cho ngày mai
1/173-36-173+175-27-175+36-50=(173-173)+(36-36)+(175-175)-(27+50)=-77
2/-(-171+171+23)-(172-38-172)-49=-23-(-38)-49=-23+38-49=15-49=-34
4/-482-176+48-(2750-176-2750)=-482-176+48+176=-482+48=-434
5/đề sai bạn ơi
Tính x biết:
(x-10)(x-15) = 2750
/-2750/ -(2085 +2750) - [ - 438 - ( 85 - |-438 | )]
| - 2750 | - ( 2085 + 2750 ) - [ - 438 - ( 85 - | - 438 | )]
= 2750 - 4835 - [ - 438 - ( -353 ) ]
= - 2085 - ( - 85 )
= - 2000
Trả lời:
|-2750| - (2085 +2750) - [ - 438 - ( 85 - |-438 | )]
= 2750 - 2085 - 2750 - (-438 - 85 + 438)
= (2750 - 2750) - 2085 - (-85)
= 0 - 2085 + 85
= -2000
Hok tốt!
Vuong Dong Yet
Tính bằng hai cách
a) 118752 : (24 x 4) b) (2750 x 250) : 25
118752 : (24 x 4) (2750 x 250) : 25
-(-2750)-(2081+2750)-{[-438-(19-438)]-2081}
Tính x biết:
(x-10)(x-15) = 2750
(x-10)(x-15)=2750
⇔x2 - 25x +150=2750
⇔x2 - 60x + 40x - 2600 = 0
⇔(x2 - 60x) + (40x - 2600) = 0
⇔x(x - 60) + 40(x - 60) = 0
⇔(x + 40)(x - 60) = 0
⇔\(\left[{}\begin{matrix}x+40=0\\x-60=0\end{matrix}\right.\)
⇔\(\left[{}\begin{matrix}x=-40\\x=60\end{matrix}\right.\)
\(-482-\left(176-482\right)-\left[2750-\left(176+2750\right)\right]\)
- 482 - ( 176 - 482 ) - [ 2750 - ( 176 + 2750 ) ]
= - 482 - 176 + 482 - ( 2750 - 2926 )
= 482 - 482 - 176 - ( - 176 )
= 0 - 0
= 0
Thực hiện phép tính (Hợp lí nếu có thể)
1)2750 - 1229 + 2750 - (-438 - 29 - 438)
2)(-38 - 17).(-9) + 35.(-9 - 11)
3)500 - {5[409 - (23.3 - 21) 2 ] + 103} : 15
Nhanh + đúng, mk sẽ k
1) = 2750 - 1229 + 2570 + 438 + 29 + 438
= (2750 + 2750) - (1229 - 29) + (438 + 438)
= 5500 - 1200 + 876
= 5176
2) = 38.9 + 17.9 - 35.9 - 11.35
= (38+17-35).9 - 11.35
= 20.9 - 11.35
= 180 - 385
= -205
3) = 500 - \(\left\{5.\left[409-\left(24-21\right)^2\right]+1000\right\}\) : 15
= 500 - \(\left\{5.\left[409-9\right]+1000\right\}:15\)
= 500 - \(\left\{5.400+1000\right\}:15\)
= 500 - (2000 + 1000) : 15
= 500 - 200
= 300
Bài 2: Tìm x
a, 936 - ( X + 24 ) = 72
b, 1635 - ( X - 39 = 482
c, 2750 - ( 85 - X ) = 2670
Bài làm :
a) 936 - ( x + 24 ) = 72
x + 24 = 936 - 72
x + 24 = 864
x = 840
b) 1635 - ( x - 39 ) = 482
x - 39 = 1635 - 482
x - 39 = 1153
x = 1192
c) 2750 - ( 85 - x ) = 2670
85 - x = 2750 - 2670
85 - x = 80
x = 5
Học tốt nhé
936-(x+24)=72 => (x+24)=936-72 =>(x+24)=864 =>x=864-24 =>x=840
vậy x=840
1635-(x-39)=482 =>(x-39)=1635-482=>(x-39)=1153=>x=1153+39=>x=1192
vậy x=1192
2750-(85-x)=2670=>(85-x)=2750-2670=>(85-x)=80=>x=85-80=>x=5
vậy x=5
a, 936 - ( x + 24 ) = 72
<=> x + 24 = 936 - 72
<=> x + 24 = 864
<=> x = 840
Vậy x = 840
b, 1635 - ( x - 39) = 482
<=> x - 39 = 1635 - 482
<=> x - 39 = 1153
<=> x = 1192
Vậy_
c,tuong tu