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Lời giải:
1. $(x+2)-2=0$
$x+2=2$
$x=0$
2.
$(x+3)+1=7$
$x+3=7-1=6$
$x=6-3=3$
3.
$(3x-4)+4=12$
$3x-4+4=12$
$3x=12$
$x=12:3=4$
4.
$(5x+4)-1=13$
$5x+4=13+1=14$
$5x=14-4=10$
$x=10:5=2$
5.
$(4x-8)-3=5$
$4x-8=5+3=8$
$4x=8+8=16$
$x=16:4=4$
6.
$3+(x-5)=7$
$x-5=7-3=4$
$x=4+5=9$
7.
$8-(2x-4)=2$
$2x-4=8-2=6$
$2x=6+4=10$
$x=10:2=5$
8.
$7+(5x+2)=14$
$5x+2=14-7=7$
$5x=7-2=5$
$x=5:5=1$
9.
$5-(3x-11)=1$
$3x-11=5-1=4$
$3x=11+4=15$
$x=15:3=5$
10.
$16-(8x+2)=6$
$8x+2=16-6=10$
$8x=10-2=8$
$x=8:8=1$
A) 28.19+(-21).4-14.10-11.128
=28.19-21.4-14.10-11.128
=532-84-140-1408
=-1100
B) 40-(4x+77)= -15+74.(-3)
40-4x-77=-15.(-222)
-37-4x =3330
-4x=3330+37
-4x=3367
x= \(\dfrac{-3367}{4}\)
7x+24=-40-x
7x+x=-40-24
8x=-64
x=-64:8
x=-8
4x-10=-109+7x
4x-7x=-109+10
-3x=-99
x=-99:(-3)
x=-33
5x-77=-21-2x
5x+2x=77-21
7x=56
x=56:7
x=8
541-(2018-x)=-735
541-2018+x=-735
x=-735-541+2018
x=742
mình chỉ làm được vậy thôi.
chúc bạn học tốt
a: \(=\dfrac{1}{7}\cdot\dfrac{17}{5}-\dfrac{3}{2}\cdot\dfrac{2-7}{12}\)
\(=\dfrac{17}{35}-\dfrac{-15}{24}\)
\(=\dfrac{17}{35}+\dfrac{15}{24}=\dfrac{311}{280}\)
b: \(=\dfrac{25}{77}-\dfrac{3-7}{15}\cdot\dfrac{10}{11}:\dfrac{3}{4}\)
\(=\dfrac{25}{77}+\dfrac{4}{15}\cdot\dfrac{10}{11}\cdot\dfrac{4}{3}\)
\(=\dfrac{25}{77}+\dfrac{32}{99}=\dfrac{449}{693}\)
a) -15x + 20 =-25
\(\Leftrightarrow\) -15x = -25 - 20 = -45
\(\Leftrightarrow\)x = 3
1: \(28\in B\left(2\right)\)
2: \(125\in B\left(5\right)\)
3: \(22\notinƯ\left(3\right)\)
4: \(8\in B\left(4\right)\)
5: \(77\notin B\left(8\right)\)
6: \(49\in B\left(7\right)\)
7: \(666\in B\left(6\right)\)
8; \(6780\in B\left(10\right)\)
a ) 2x + 5 = 17
2x = 17 - 5
2x = 12
x = 12 : 2
x = 6
b ) -14 + 3x = 13
3x = 13 - ( -14 )
3x = -27
x = -27 : 3
x = -9
c ) 4x - 13 = -77
4x = ( -77 ) + 13
4x = 64
x = 64 : 4
x = 16
\(a,2x+5=17\)
\(2x=17-5\)
\(2x=12\)
\(x=12:2\)
\(x=6\)
\(b,-14+3x=13\)
\(3x=13+14\)
\(3x=27\)
\(x=27:3\)
\(x=9\)
\(c,4x-13=-77\)
\(4x=-77+13\)
\(4x=-64\)
\(x=-64:4\)
\(x=-16\)
\(4x-1+3=-10+77\\\Rightarrow 4x+2=67\\\Rightarrow 4x=67-2\\\Rightarrow 4x=65\\\Rightarrow x=\frac{65}{4}\)
Bằng 1:))