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1/ -7264 + (1543 + 7264)
=-7264 + 1543 + 7264=1543
2/ (144 – 97) – 144
=144-97-144=-97
3/ (-145) – (18 – 145)(Vì có dấu trừ ở trước ngoặc nên p đổi dấu)
=-145-18+145=-18
4/ 111 + (-11 + 27)
=111-11+27=137
24.x-32.x=145-255:51
16.x-9.x=145-5
16.x-9.x=140
x.(16-9)=140
x.7=140
x=140:7
x=20
580:(x-24)=329-150:2=ko bít
7.(x-4)+35=25+279:9
7.(x-4)+35=25+31
7.(x-4)+35=56
7.(x-4)=56-35
7.(x-4)=21
x-4=21:7
x-4=3
x=3+4
x=7
Ủng hộ nha!
Bài 2:
a: Ta có: \(2x+79=x+45\)
nên 2x-x=45-79
hay x=-24
b: Ta có: \(15-\left(x+7\right)=\left(x-8\right)+22\)
\(\Leftrightarrow8-x-x-14=0\)
\(\Leftrightarrow2x=22\)
hay x=11
a) \(2^4.x-3^2.x=145-\frac{255}{51}\Rightarrow x.\left(2^4-3^2\right)=145-5\)
\(\Rightarrow7.x=140\Rightarrow x=20\)
b) \(\frac{580}{x-24}=329-150.2\Rightarrow\frac{580}{x-24}=329-300\Rightarrow\frac{580}{x-24}=29\Rightarrow x-24=20\)
\(\Rightarrow x=44\)
c) \(7.\left(x-14\right)+35=25+\frac{279}{9}\Rightarrow7.\left(x-14\right)=25+31-35\)
\(\Rightarrow7.\left(x-14\right)=21\Rightarrow x-14=3\Rightarrow x=17\)
b)580:(x-24)=329-150.2 580:(x-24)=329-300 580:(x-24)=29 (x-24)=580:29 (x-24)=20 x=20+24 x=44
a, 27x 36 + 73 x 99 + 27 x 14 - 49 x 73
= 27 ( 36 + 14 ) + 73 ( 99 - 49 ) = 27 x 50 + 73 x 50
= 50 ( 27 + 73) = 50 x 100 = 5 000
b, 21 x (271 + 29 ) + 79 x ( 271 + 29)
= (271 + 29 ) ( 21 + 79)
= 300 x 100 = 30 000
6, \(x=\dfrac{9}{2}+\dfrac{1}{2}=\dfrac{10}{2}=5\)
7, \(x=-\dfrac{3}{4}-\dfrac{5}{4}=-\dfrac{8}{4}=-2\)
8, \(x=\dfrac{5}{7}-\dfrac{2}{7}=\dfrac{3}{7}\)
9, \(x=\dfrac{1}{3}+\dfrac{4}{3}=\dfrac{5}{3}\)
10, \(x=-\dfrac{7}{2}-\dfrac{5}{2}=-\dfrac{12}{2}=-6\)
\(6,x-\dfrac{1}{2}=\dfrac{9}{2}\Leftrightarrow x=5\)
\(7,x+\dfrac{5}{4}=\dfrac{-3}{4}\Leftrightarrow x=-2\)
\(8,x+\dfrac{2}{7}=\dfrac{5}{7}\Leftrightarrow x=\dfrac{3}{7}\)
\(9,x-\dfrac{4}{3}=\dfrac{1}{3}\Leftrightarrow x=\dfrac{5}{3}\)
\(10,x+\dfrac{5}{2}=\dfrac{-7}{2}\Leftrightarrow x=-6\)
a)24.x -32.x =145-255:51
x . (24 - 32) = 145 - 5
x . (32 - 9) = 140
x . 23 = 140
x = 140 : 23
x = ????
b)580 : ( x -24)=329-150* 21
580 : (x - 24) = 329 - 300
580 : (x - 24) = 29
x - 24 = 580 : 29
x - 24 = 20
x = 20 + 24
x = 44
c) 4x + 4x+1 + 4x+3=1136
4x + 4x .41 + 4x .43 = 1136
4x . ( 1 + 4 + 43) = 1136
4x . 64 = 1136
4x = 1136 : 64
a)4*x+79*29=79*33
4*x+2291=2607
4*x=2607-2291=316
x=316:4=79
b)83-3*(7+x)=64
3*(7+x)=83- 64=19
7+x=19:3=19/3
x=19/3-7=-2/3
dễ vây mà