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d ) 26 - ( x - 5 ) = 32
x - 5 = 26 - 32
x - 5 = - 6
x = - 6 + 5
x = - 1
Vậy x = - 1
\(a.x\in B\left(8\right)=\left\{0;8;16;24;32;...\right\}\)
\(\text{Mà }x\le30\Rightarrow x\in\left\{0;8;16;24\right\}\)
\(b.x\in B\left(15\right)=\left\{0;15;30;45;60;75;90;105;...\right\}\)
\(\text{Mà }15\le x\le90\Rightarrow x\in\left\{15;30;45;60;75;90\right\}\)
\(c.x\in B\left(5\right)=\left\{0;5;10;15;20;30;...;85;90;95;100;105;...\right\}\)
\(\text{Mà }x\le100\Rightarrow x\in\left\{0;5;10;15;20;...;95;100\right\}\)
\(\text{d. x }⋮12\Rightarrow x\in B\left(12\right)=\left\{0;12;24;36;48;60;72;84;96;...\right\}\)
\(\text{Mà }24\le x\le80\Rightarrow x\in\left\{24;48;60;72\right\}\)
\(\left(2600+6400\right)-3\cdot x=2000\)
\(9000-3x=2000\)
\(3x=9000-2000\)
\(3x=7000\)
\(x=7000:3\)
\(x=\frac{7000}{3}\)
a ) sai đầu bài
b) 15. { 32 : [ 6 - 5 + 5 ( 9: 3 )]}
= 15 . { 32 : [ 6 - 5 + 5 . 3 ]}
= 15 . { 32 : [ 6 - 5 + 15 ] }
= 15 . { 32 : [ 1 +15 ] }
= 15 . { 32 : 16 }
= 15 . 2
= 30
bài 2:
a) 14
b)1024
Bài1:
b)15.{32:[6-5+5(9:3)]}
=15.{32:[6-5+5.3]}
=15.{32:[6-5+15]}
=15.{32:[1+15]}
=15.{32:16}
=15.2
=30
a)(x + 4) - 32 = 23
x + 4 = 23 + 32 = 55
x = 55 - 4 = 51
b) 150 - 3x = 60
3x = 150 - 60 = 90
x = 90 : 3 = 30
c) 7x + 2x - 10 = 80
9x = 80 + 10 = 90
x = 90 : 9 = 10
d) 300 - 2(x - 3) = 100
2x - 2 * 3 = 300 - 100 = 200
2x - 6 = 200
2x = 200 + 6 = 206
x = 206 : 2 = 103
11
a , x+6=49-3-13
x+6=a
x=a-6
x=n
b,231-(x-6)=n
x-6=231-n
x-6=a
x=a+6
x=m
B1:
a)49-3.(x+6)=13
3.(x+6)=49-13
3.(x+6)=36
x+6=36/3
x+6=12
x=12-6
x=6
x=3.75
(80 . x + 32) : 4 = 100 - 12
(80 . x + 32) : 4 = 88
80 . x + 32 = 88 . 4
80 . x + 32 = 352
80 . x = 352 - 32
80 . x = 320
x = 320 : 80
x = 4