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a) 15 x y - 2009 = 1201
\(15.x.y=1201+2009\)
\(15.x.y=3210\)
\(x.y=3210:15\)
\(x.y=214\)
Tới đây bó tay
b)[(z + 32) - 15 ] . 2 = 60
\(\left(z+32\right)-15=60:2\)
\(\left(z+32\right)-15=30\)
\(\left(z+32\right)=30+15\)
\(z+32=45\)
\(z=45-32\)
\(z=13\)
c)[161 + (153-z)] .18 = 3870
\(161+\left(153-z\right)=3870:18\)
\(161+\left(153-z\right)=215\)
\(153-z=215-161\)
\(153-z=54\)
\(-z=54-153\)
\(-z=-99\)
\(z=99\)
d)[43 - (56 - z)] . 12 = 384
\(43-\left(56-z\right)=384:12\)
\(43-\left(56-z\right)=32\)
\(-\left(56-z\right)=32-43\)
\(56+z=-11\)
\(z=-11-56\)
\(z=-11-56\)
\(z=-67\)
Mình có thể sai đâu đó
Mong bạn thông cảm
Chúc bạn học giỏi
a) 3x – 2 = 19
3x = 19 + 2
3x = 21
x = 21:3
x = 7
b) [43 - (56 - x)].12 = 384
43 – (56 – x) = 384:12
43 – (56 – x) = 32
56 – x = 43 – 32
56 – x = 11
x = 56 – 11
x = 45
c) 3x.2 + 15 = 33
3x.2 = 33 - 15
3x.2 = 18
3x = 18 : 2
3x = 9
3x = 33
x = 2.
a) 1 < x < 10 3 = > x ∈ {2;3}
b) 2 5 < x ≤ 23 6 = > x ∈ {1;2;3}
1. \(x-8+32=68\)
\(x-8=68-32\)
\(x-8=36\)
\(x=36+8\)
\(x=44\)
_____
2. \(x+8+32=68\)
\(x+8=68-32\)
\(x+8=36\)
\(x=36-8\)
\(x=28\)
_____
3. \(98-x+34=43\)
\(98-x=43-34\)
\(98-x=9\)
\(x=98-9\)
\(x=89\)
_____
4. \(98+x-34=43\)
\(98+x=43+34\)
\(98+x=77\)
\(x=77-98\)
\(x=-21\)
_____
5. \(x:5:4=800\)
\(x:5=800.4\)
\(x:5=3200\)
\(x=3200.5\)
\(x=16000\)
_____
6. \(18+x=384:8\)
\(18+x=48\)
\(x=48-18\)
\(x=30\)
_____
7. \(\left(84,6-2\times x\right):3,02=5,1\)
\(84,6-2.x=5,1.3,02\)
\(84,6-2.x=15,402\)
\(2.x=84,6-15,402\)
\(2.x=69,198\)
\(x=69,198:2\)
\(x=34,599\)
_____
8. \(x\times5=120:6\)
\(x.5=20\)
\(x=20:5\)
\(x=4\)
_____
9. \(\left(15\times24-x\right):0,25=100:0,25\)
\(\left(15.24-x\right):0,25=400\)
\(15.24-x=400.0,25\)
\(15.24-x=100\)
\(360-x=100\)
\(x=360-100\)
\(x=260\)
1,x-8+32=68
=>x-8=68-32=36
=>x=36+8=42
2,x+8+32=68
=>x+8=68-32=36
=>x=36-8=28
3,98-x+34=43
=>98-x=43-34=9
=>x=98-9=89
4,98+x-34=43
=>98+x=43+34=77
=>x=77-98=-21
5,x:5:4=800
=>x:20=800
=>x=800x20=16000
6,18+x=384:8=48
=>x=48-18=30
7,(84,6-2x):3,02=5,1
=>84,6-2x=5,1x3,02=15,402
=>2x=84,6-15,402=69,198
=>x=69,198:2=34,599
8,5x=120:6=20
=>x=20:5=4
9,(15x24-x):0,25=100:0,25=400
=>360-x=400x0,25=100
=>x=360-100=260.
2x+7/6+13/12+21/20+31/30+43/42+57/56+73/72+91/90=10
2x+1+1/6+1+1/12+1+1/20+1+1/30+1+1/42+1+1/56+1+1/72+1+1/90=10
2x+(1+1+1+1+1+1+1+1)+(1/2.3+1/3.4+1/4.5+1/5.6+1/6.7+1/7.8+1/8.9+1/9.10)=10
2x+8+(1-1/2+1/2-1/3+...+1/9-1/10)=10
2x+1-1/10=10-8
2x+9/10=2
2x=2-9/10
2x=11/10
x=11/10/2
x=11/20
Đáp án D
+ ) 1 2 - 2 3 x - 1 3 = - 2 3 2 3 x - 1 3 = 1 2 - - 2 3 2 3 x - 1 3 = 7 6 2 3 x = 7 6 + 1 3 2 3 x = 3 2 x = 3 2 : 2 3 x = 9 4
Nên x 1 = 9 4
+ ) 5 6 - x = - 1 12 + 4 3 5 6 - x = 5 4 x = 5 6 - 5 4 x = - 5 12
Nên x 2 = - 5 12
Từ đó x 1 + x 2 = 9 4 + - 5 12 = 11 6
\(\left[43-\left(56-x\right)\right]\times12=384\)
\(43-\left(56-x\right)=384:12\)
\(43-\left(56-x\right)=32\)
\(56-x=43-32\)
\(56-x=11\)
\(x=56-11\)
\(x=45\)
[43−(56−x)]×12=384
43−(56−�)=384:1243−(56−x)=384:12
43−(56−�)=3243−(56−x)=32
56−�=43−3256−x=43−32
56−�=1156−x=11
�=56−11x=56−11
�=45x=45