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Bài 1:
22 x 567 - 356 x 22 + 22 x 789
= 22 x ( 567 - 356 + 789 )
= 4 x 1000
= 4000
Bài 2:
12x - 10x = 58 + 2010
2x = 390626
x = 390626 : 2
x = 195313
1
4!+5!
=1.2.3.4+1.2.3.4.5
=24+120=144
2
2!+x=23+5!
2+x=143
x=143-2
vậy x=141
12x+10x=88
x(12+10)=88
x.22=88
x=88:22
vậy x= 4
4!+5!=1.2.3.4+1.2.3.4.5=24+120=144
2!+x=23+5!
1.2+x=23+1.2.3.4.5
2+x=23+120
2+x=143
x=143-2
x=141
Vậy x=141
12x+10x=88
(12+10)x=88
22x =88
x =88:22
x =4
Vây x=4
a)-5 ( 3x - 7 ) - ( -15x +3 ) - ( 12-x )= -4
=>-15x+35+15x-3-12+x=-4
=>(-15x+15x)+(35-3-12)+x=-4
=>0+20+x=-4
=>20+x=-4
=>x=-4-20
=>x=-24
b)-3 ( 4x -2 ) - ( -12x +8 ) - (-x)=0
=>-12x+6+12x-8+x=0
=>(-12x+12x)+(6-8)+x=0
=>0+(-2)+x=0
=>(-2)+x=0
=>x=0-(-2)
=>x=2
2: 12-10x=25-30x
=>20x=13
=>x=13/20
3: \(3\left(2x+3\right)-2\left(4x-5\right)=10x+21\)
=>6x+9-8x+10=10x+21
=>10x+21=-2x+19
=>12x=-2
=>x=-1/6
4: \(\Leftrightarrow25x-15-6x+12=11-5x\)
=>19x-3=11-5x
=>24x=14
=>x=7/12
5: \(\Leftrightarrow8-12x-5+10x=4-6x\)
=>4-6x=-2x+3
=>-4x=-1
=>x=1/4
6: \(\Leftrightarrow32x-24-6+9x=13-40x\)
=>41x-30=13-40x
=>81x=43
=>x=43/81
7: \(\Leftrightarrow10x-5+20x=5x-11\)
=>30x-5=5x-11
=>25x=-6
=>x=-6/25
a) \(\left(x-5.4\right)=0\)
\(\Leftrightarrow x-20=0\)
\(\Leftrightarrow x=0+20\)
\(\Leftrightarrow x=20\)
b) \(6x+4x=201\)
\(\Leftrightarrow10x=201\)
\(\Leftrightarrow x=201:10\)
\(\Leftrightarrow x=20,1\)
c) \(\left(x-4\right)\left(x-3\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x-4=0\\x-3=0\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=0+4\\x=0+3\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=4\\x=3\end{cases}}\)
1)8(4x-3)-3(2-3x)=13-40x
(32x-24)-(6-9x)=13-40x
32x-24-6+9x=13-40x
41x-30=13-40x
41x+40x=13+30
81x=43
x=43/81
Vậy x=43/81
2)10x-5(1-4x)=5x-11
10x-(5-20x)=5x-11
10x-5+20x=5x-11
30x-5=5x-11
30x-5x=5-11
25x=-6
x=-6/25
Vậy x=-6/25
12x - 10x = 5^8 : 5^4 + 201^0
2x = 5^4 + 1
2x = 625 + 1
2x = 626
x = 626 : 2
x = 313
\(12x-10x=5^8:5^4+201^0\)
\(\Rightarrow x\left(12-10\right)=5^4+1\)
\(\Rightarrow2x=625+1=626\)
\(\Rightarrow x=626:2=313\)
Vậy x = 313