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70 - 5 . ( 2.x - 3 ) = 45
5( 2x -3 ) = 70 - 45
5( 2x-3 ) = 25
2x-3 = 5
2x = 8
x = 4
a) 70-5(x-3) = 45
5(x-3) = 70 - 45
5(x-3) = 25
x-3 = 25 : 5
x-3 = 5
x = 5 + 3
x = 8
b) 10+2x = 45 : 43
10+2x = 42
10+2x = 16
2x = 16 - 10
2x = 6
x = 6 : 2
x = 3
Hot boy!~~
a) 70-5.(x-3)=45
=> 5.(x-3)=70-45
=>5.(x-3)=25
=>x-3=25:5
=>x-3=5
=>x=8
b) \(10+2x=4^5:4^3\)
\(\Rightarrow10+2x=16\)
\(\Rightarrow2x=16-10\)
\(\Rightarrow2x=6\)
\(\Rightarrow x=3\)
70 - 5(x-3) = 45
5(x-3) = 70 - 45 = 25
x - 3 = 25 : 5 = 5
x = 5 + 3 = 8
a)\(8+2x=20\)
\(2x=14\)
\(x=\frac{14}{2}=7\)
vậy x=7
b)\(70-5\left(x+3\right)=45\)
\(5\left(x+3\right)=25\)
\(x+3=5\)
\(x=2\)
Vậy \(x=2\)
c)\(\left(3x-2^4\right).7^3=2.7^4\)
\(\left(3x-16\right)=\frac{2.7^4}{7^3}\)
\(3x-16=7.2\)
\(3x-16=14\)
\(3x=30\)
\(x=10\)
Vậy \(x=10\)
Answer:
Bài 3:
\(334-\left(-75\right)+[\left(-175\right)-34]\)
\(=334+75-175-34\)
\(=\left(334-34\right)+\left(75-175\right)\)
\(=300+\left(-100\right)\)
\(=200\)
\(68-\left(-45\right)-[368-\left(-145\right)]\)
\(=68+45-[368+145]\)
\(=\left(68-368\right)+\left(45-145\right)\)
\(=\left(-300\right)+\left(-100\right)\)
\(=-400\)
Bài 4:
\(-17-\left(x-5\right)=-52\)
\(\Rightarrow x-5=-17-\left(-52\right)\)
\(\Rightarrow x-5=35\)
\(\Rightarrow x=40\)
\(3\left(7-x\right)+\left(-12\right)=-75\)
\(\Rightarrow3\left(7-x\right)=-75-\left(-12\right)\)
\(\Rightarrow3\left(7-x\right)=-63\)
\(\Rightarrow7-x=-21\)
\(\Rightarrow x=28\)
70 - 5(x - 3) = 45
-5(x - 3) = 45 - 70
-5(x - 3) = -25
x - 3 = (-25) : (-5)
x - 3 = 5
x = 5 + 3
x = 8
Trả lời:
\(70-5\times\left(x-3\right)=45\)
\(\Leftrightarrow5\times\left(x-3\right)=25\)
\(\Leftrightarrow x-3=5\)
\(\Leftrightarrow x=8\)
Vậy \(x=8\)
\(a,\left(x-27\right).\left(x-3\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-27=0\\x-3=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=0+27\\x=0+3\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=27\\x=3\end{cases}}\)
\(b,70-5.\left(2x-3\right)=45\)
\(\Rightarrow5.\left(2x-3\right)=70-45\)
\(\Rightarrow5.\left(2x-3\right)=25\)
\(\Rightarrow2x-3=25\div5\)
\(\Rightarrow2x-3=5\)
\(\Rightarrow2x=5+3\)
\(\Rightarrow2x=8\)
\(\Rightarrow x=8\div2\)
\(\Rightarrow x=4\)
~Study well~
#KSJ
70 - 5(3-x) = 45
=> 5(3-x) = 70 - 45
=> 5(3-x) = 25
=> ( 3-x) = 25 : 5
=> (3-x) = 5
=> x = 5 + 3
=> x = 8
Vậy x = 8
~ Học tốt ~
70 - 5 ( 3 - x ) = 45
5 ( 3 - x ) = 70 - 45
5 ( 3 - x ) = 25
3 - x = 25 : 5
3 - x = 5
x = 3 - 5
x = -2
Chúc bạn học tốt!!!