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\(\left(2x+1\right):7=2^2+3^2 \)
\(\Leftrightarrow\left(2x+1\right):7=13\)
\(\Leftrightarrow2x+1=13.7\)
\(\Leftrightarrow2x+1=91\)
\(\Leftrightarrow2x=90\)
\(\Leftrightarrow x=45\)
\(400-x.3=100\)
\(\Leftrightarrow-x.3=400-100\)
\(\Leftrightarrow-x.3=300\)
\(\Leftrightarrow-x=300:3\)
\(\Leftrightarrow x=100\)
\(96-3\left(x+8\right)=42\)
\(\Leftrightarrow3\left(x+8\right)=96-42\)
\(\Leftrightarrow3\left(x+8\right)=54\)
\(\Leftrightarrow x+8=54:3\)
\(\Leftrightarrow x+8=18\)
\(\Leftrightarrow x=10\)
\(15.5\left(x-35\right)-525=0\)
\(\Leftrightarrow75\left(x-35\right)-525=0\)
\(\Leftrightarrow75\left(x-35\right)=525\)
\(\Leftrightarrow75x-2625=525\)
\(\Leftrightarrow75x=525+5625\)
\(\Leftrightarrow75x=3150\)
\(\Leftrightarrow x=42\)
- Chúc bạn làm bài tốt !
a) 7x - 8 = 713
7x = 713 + 8
7x = 721
x = 721 : 7
x = 103
b) 8 ( x - 3 ) = 0
x - 3 = 0 : 8
x - 3 = 0
x = 0 + 3
x = 3
c) 4x : 17 = 0
4x = 0 . 17
4x = 0
x = 0 : 4
x = 0
d) 96 - 3 ( x + 1 ) = 42
3 ( x + 1 ) = 96 - 42
3 ( x + 1 ) = 54
x + 1 = 18
x = 17
a )531 + ( 218 - x ) = 735
218 - x = 735 - 531
218 - x = 204
x = 218 - 204
x = 14
a ) 541 + ( 218 - x ) = 735
218 - x = 735 - 541
218 - x = 194
x = 218 - 194
x = 24
b,\(96-3\left(x+1\right)=42\Rightarrow96-42=3\left(x+1\right)\Rightarrow54=3\left(x+1\right)\Rightarrow x+1=54\div3=18\Rightarrow x=18-1=17\)
d,\(\left[178-\left(13x-8\right)\right]\cdot53=5724\Rightarrow178-\left(13x-8\right)=5724\div53=108\Rightarrow178-108=13x-8\Rightarrow13x-8=70\Rightarrow13x=70+8=78\Rightarrow x=78\div13=6\)
1. \(96-3\left(x.1\right)=42\)
\(96-3x=42\)
\(3x=96-42\)
\(3x=54\)
\(x=54:3\)
\(x=18\)
2.Theo bài ra ta có: \(a-b=8\)
a. Ta có: \(7a-7b=7\left(a-b\right)\)
\(=7.8=56\)
Bài 1:
96-3(x.1)=42
3.(x.1)= 96 - 42
3. (x.1)= 54
x.1= 54:3
x.1= 18
x=18:1=18
Vậy x = 18
Bài 2:
a) 7a-7b
Theo đề bài cho a-b=8
⇒ 7.a-7.b = 7. (a-b)=7.8=56
96 - 3(x + 1) = 42
3(x +1 ) =96-42
3(x+1) = 54
x +1 = 54 :3
x + 1 = 18
x = 18-1
x = 17
96-3(x+1)=42
3(x+1)=96-42
3(x+1)=54
x+1 = 54 : 3
x+1 = 18
x = 18 - 1
x = 17
96 - 3(x + 1) = 42
\(\Rightarrow\)3x + 3 = 54
\(\Rightarrow\)3x = 51
\(\Rightarrow\)x = 17
96 - 3(X + 8)= 42
3(X + 8)= 96 - 42
3(X + 8)= 54
X + 8 = 54:3
X + 8= 18
X = 10
a)96-3(x+8)=42
3(x+8)=96-42
3(x+8)=54
x+8=54:3
x+8=18
x=18-8
x=10
chúc bạn học tốt!