( x - 25 ) nhan 17 = 34
145 + ( 150 - x ) = 250
( 2 nhân x - 7 ) nhan 81 = 0
x - 90 : 15 = 32
520 - ( x - 5 ) = 250 : 5
18 nhân 19 - 250 : 15 + 35 : 7 + 8
289 : 17 + 324 : 18 + 21 : 3
( 72 + 128 + 64 ) - 25 nhan 8
3500 : 50 + 9 ( 126 + 81 + 15 ) : 5
1 + 3 + 5 + 7 + ......... + 299
25 2/13 -(15/17+ 15 2/3)
5/30 + 15/90+250/150+350/210+45/270
3 1/11 nhân 27/46 nhân 1 6/17 nhân 2 4/9
\(25\frac{2}{13}-\left(\frac{15}{17}+15\frac{2}{3}\right)=\frac{327}{13}-\left(\frac{15}{17}+\frac{47}{3}\right)\)
\(=\frac{327}{13}-\frac{844}{51}\)
\(=\frac{5705}{663}\)
\(\frac{5}{30}+\frac{15}{90}+\frac{250}{150}+\frac{350}{210}+\frac{45}{270}=\frac{1}{6}+\frac{1}{6}+\frac{5}{3}+\frac{5}{3}+\frac{1}{6}\)
\(=\frac{3}{6}+\frac{10}{3}\)
\(=\frac{1}{2}+\frac{10}{3}\)
\(=\frac{23}{6}\)
\(3\frac{1}{11}.\frac{27}{46}.1\frac{6}{17}.2\frac{4}{9}=\frac{34}{11}.\frac{27}{46}.\frac{23}{17}.\frac{22}{9}\)
\(=\frac{68}{9}.\frac{27}{34}\)
\(=6\)
75 : { 250 - [ 175 + ( 2 mu 3 nhan 5 mu 2 - 6 nhan 25 ) ]}
=75:{250-[175+(8x25-150)]}
=75:{250-[175+(200-150)
=75:[250-(175+50)
=75:(250-225)
=75:25
=3
7,2 chia 2,4 nhan X= 4,5
X nhan4,8 cong 5,2nhan X= 160
9,15nhan X cong 2,85 nhan X=48
[X nhan 3 cong 4 ] chia 5 =8
[15 nhan 28 - X] chia 2/5= 200 chia 0,4
7 nhan [8 cong 2 nhan X]= 210
X nhan 5,6 cong 4,4 nhan X= 130
[ X - 12] nhan 17 chia 11 = 51
9,15 nhan cong 2,85 nhan X= 48
tim X nha m.n
a ma cai nay mk rat voi nen nhanh jup mk nha
[......] cai nay la dau nghoach nha
1. . 7,2 : 2,4 x X = 4,5
3 x X = 4,5
X = 4,5 : 3
X = 1,5
2. X x 4,8 + 5,2 x X = 160
=> X x ( 5,2 + 4,8 ) = 160
X x 10 = 160
X = 160 : 10
X = 16
3. 9,15 x X + 2,85 x X =48
=> ( 9,15 + 2,85 ) x X = 48
12 x X = 48
X = 48 : 12
X = 4
4. ( X x 3 + 4 ) : 5 = 8
X x 3 + 4 = 8x 5
X x 3 + 4 = 40
X x 3 = 40 - 4
X x 3 = 36
X = 36 : 3
X = 12
5. ( 15 x 28 - x ) : 2/5 = 200 : 0,4
15 x 28 - x = 200 : 0,4 x 2/5
15 x 28 - x = 200
15 x 28 = 200 + x
420 = 200 + x
x = 420 - 200
x = 220
6. 7 x ( 8 + 2 x X ) = 210
8 + 2 x X = 210 : 7
8 + 2x = 30
=> 2x = 30 - 8
2x = 22
x= 22 : 2
x = 11
7. X x 5,6 + 4,4 x X = 130
X x ( 5,6 + 4,4 ) = 130
X x 10 = 130
X = 130 : 10
X = 13
8. ( x - 12 ) x 17 : 11 = 51
x - 12 = 51 x 11 : 17
x - 12 = 33
x = 33 + 12
x = 45
9. 9,15 x X + 2,85 x X = 48
X x ( 9,15 + 2,85 ) = 48
X x 10 = 48
X = 48 : 10
X = 4,8
cau nay ban lam sai
[X nhan 7 cong 8 ] chia 5 = 10
280 chia [7 cong 3 nhan X] = 4
[ X nhan 5] nhan 19 chia 13= 57
6 nhan [28 - 8] nhan X ] = 72
4 nhan [ 36 - 4 nhan X] = 3,2
[X - 15] nhan 3 chia 12 =6
[ X chia 4 cong 6] nhan 7=70
[ X chia 2 cong 50] chia 5=12
5 nhan [ 7 cong 3 nhan X] = 140
help me ////\\\\\
tim X nha mn jup mk ik mk dg voi lam
a) (x.7 +8):5=10
x.7 +8= 10.5=50
x.7= 50-8=42
x= 42:7=6
b) 280: (7+3.x)=4
7+3.x= 4.280= 1120
3.x= 1120-7 =1113
x= 1113: 3= 371
c) (x.5) .19:13= 57
(x.5). 19= 57.13= 741
x.5= 741: 19= 39
x= 39:5 =7,8
d) 6.(28-8).x = 72
20.x= 72:6= 12
x= 12: 20= 0,6
e) 4. (36-4.x)= 3,2
36-4.x= 32:4= 0,8
-4.x= 0,8- 36= -35,2
x= -35,2 : -4 = 8,8
f) (x-15).3 :12= 6
(x-15).3 = 6. 12= 72
x-15= 72: 3= 24
x= 24+ 15= 39
g) (x:4+ 6) . 7 = 70
x:4+6= 70:7= 10
x:4= 10-6= 4
x= 4.4 = 16
h) (x:2+50) :5= 12
x:2+ 50= 12.5= 60
x:2= 60-50= 10
x= 10.2=20
l) 5.(7+3.x)= 140
7+3.x= 140:5 = 28
3.x= 28-7 =21
x= 21: 3= 7
k cho mình nhe
96-3(x+8)=42
15.5.(x-25)-225=0
250:x+15=25
36:(x-5)=2^2
[3.(70-x)+5]:2=46
\(a,96-3\left(x+8\right)=42\\ \Rightarrow3\left(x+8\right)=54\\ \Rightarrow x+8=18\\ \Rightarrow x=10.\\ b,15.5\left(x-25\right)-225=0\\ \Rightarrow75\left(x-25\right)-225=0\\ \Rightarrow75\left(x-25\right)=225\\ \Rightarrow x-25=3\\ \Rightarrow x=28.\\ c,250:x+15=25\\ \Rightarrow250:x=10\\ \Rightarrow x=25\\ d,36:\left(x-5\right)=2^2\\ \Rightarrow36:\left(x-5\right)=4\\ \Rightarrow x-5=9\\ \Rightarrow x=14.\\ e,\left[3.\left(70-x\right)+5\right]:2=46\\ \Rightarrow3.\left(70-x\right)+5=92\\ \Rightarrow3\left(70-x\right)=87\\ \Rightarrow70-x=29\\ \Rightarrow x=41.\)
Ai giải giùm mik bài tóa này nha
1 Tính :
a)5+(-5)
b)71-52
c)28+(-82)
d)47+(-30)
e)(-41)+(-59)
f)75+(-10)
t)26-43
y)90-25
o)72+(-9)
p)(-3)+3
2 Tính nhanh :
a)(-150)-47+150-53
b)250+(-90)-250-10+100
c)71+92-28-(-29)+8-72
d)45+(-31)-45+(-31)
3 Tìm x biết :
a)x-5=-15
b)21+x=-79
c)x-15=-23+(-6) d)200-x=/-32/-41
vì bài dài nên mk chỉ ghi kết quả thui nha
a,0
b,19
c,-54
d,17
e,-100
f,65
t,17
y,65
o,63
p,0
3,
a,-10
b,-100
1 Tính :
a)5+(-5)=0
b)71-25=46
c)28+(-82)=-54
d)47+(-30)=17
e)(-41)+(-59)=-100
f)75+(-10)=65
t)26-43=-17
y)90-25=65
o)72+(-9)=63
p)(-3)+3=0
2 Tính nhanh :
a)(-150)-47+150-53
=(-150+150)-47-53
=-100
b)250+(-90)-250-10+100
=(250-250)+(-90)-10+100
=0
c)71+92-28-(-29)+8-72
=71+92-28+29+8-72
=(71+29)+(92+8)-(28+72)
=100+100-100
=100
d)45+(-31)-45+(-31)
=(45-45)+(-31+-31)
=-62
3 Tìm x biết :
a)x-5=-15
x=-15+5
x=-10
b)21+x=-79
x=-79-21
x=-100
c)x-15=-23+(-6)
x-15=-29
x=-29+15
x=-14
d)200-x=/-32/-41
200-x=32-41
200-x=-9
-x=-9-200
-x=-209
=>x=209
Bài 1
trả lời :
Câu a : 5 + (-5) = 0
Câu b : 71 - 52 = 19
Câu c : 28 + (-82) = -54
Câu d : 47 + (-30) = 17
Câu e : (-41) + (-59) = -100
Câu f : 75 + (-10) = 65
Câu t : 26 - 43 = -17
Câu y: 90 - 25 = 65
Câu o : 72 + (-9) = 63
Câu p : (-3) + 3 = 0
Bài 2
Trả lời :
Câu a : ( -150) - 47 + 150 - 53
(-150+150) - (-47 - 53)
0 - 96
= 96
Câu b : 250 + ( -90) - 250 - 10 + 100
( 250 -250 ) + ( -90 - 10 + 100 )
=0
Câu c : 71 +92 - 28 - ( -29 ) + 8 - 72
( 71 - 72 ) + ( 92 + 8 ) - ( -28 - 29 )
-1 + 100 - 57
= 42
Câu d : 45 + ( -31) - 45 + ( -31)
( 45 - 45 ) + ( -31 - 31 )
0 + (- 61 )
= -61
Bài 3
Trả lời :
Câu a : X - 5 = -15
X = -15 + 5
X = 10
Vậy X = 10
Câu b: 21 + X = -79
X = -79 - 21
X = -100
Vậy X = -100
Câu c : X -15 = -23 +(-6)
X - 15 = -29
X = -29 +15
X = - 6
Vậy X = -6
chúc bn lm bài vui vẻ kb với mk nha
tim x nha mn
l,[12 nhan 15 - x] nhan 1/4= 120 nhan 1/4
i, [x nhan 0,25 cong 2012 ] nhan 2013 =[50 cong 2012] nhan 2013
k,[ x - 1/2] nhan 5/3 = 7/4 - 1/2
\(\left[12\cdot15-x\right]\cdot\frac{1}{4}=120\cdot\frac{1}{4}\)
\(\Leftrightarrow\left[180-x\right]\cdot\frac{1}{4}=30\)
\(\Leftrightarrow180-x=30:\frac{1}{4}\)
\(\Leftrightarrow180-x=120\)
\(\Leftrightarrow x=60\)
\(\left[x\cdot0,25+2012\right]\cdot2013=\left[50+2012\right]\cdot2013\)
\(\Leftrightarrow x\cdot0,25\cdot2013+2012\cdot2013=2062\cdot2013\)
\(\Leftrightarrow x\cdot\frac{2013}{4}+4050156=4150806\)
\(\Leftrightarrow x\cdot\frac{2013}{4}=100650\)
\(\Leftrightarrow x=100650:\frac{2013}{4}=100650\cdot\frac{4}{2013}=200\)
bài 1:tính nhanh nếu có thể
250:{855:[540-(81+62x23)]}
bai2:tìm số tự nhiên x
a.(x-17).200=400
b.(x-105):21=15
c.541+(218-x)=735
d.24+5x=75:73
bài 1:tính nhanh nếu có thể
250:{855:[540-(81+62x23)]}
= 250:{855:[540-( 81 + 36 x 8)]}
= 250:{855:[540-( 81 + 288 )]}
= 250:{855:[540 - 369 ]}
= 250:{855 : 171}
= 250:5
= 50
bài 2:tìm số tự nhiên x
a.(x-17).200=400
( x - 17 ) = 400 : 200
x - 17 = 2
x = 2 + 17
x = 19
b.(x-105):21=15
( x - 105 ) = 15 x 21
( x - 105 ) = 315
c.541+(218-x)=735
(218-x) = 735 - 541
218-x = 194
x = 218 - 194
x = 24
d.24+5x=75:73
24 + 5x = 72
24 + 5x = 49
5x = 49 - 24
5x = 25
=> x = 25 : 5
x = 5