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\(42-\left(2x+32\right)+12:2=6\)
\(\Rightarrow42-\left(2x+32\right)+12=12\)
\(\Rightarrow42-\left(2x+32\right)=0\)
\(\Rightarrow2x+32=42\)
\(\Rightarrow2x=10\)
\(\Rightarrow x=5\)
42-(2x+32)+12:2=6
(2x+32)+6=42-6
(2x-32)+6=36
(2x-32)=36-6
2x-32=30
2x=30+32
2x=62
x=62:2
x=31
Tk mk nha
\(42-\left(2x+32\right)+12:2=6\)
\(\Rightarrow42-\left(2x+32\right)+12=12\)
\(\Rightarrow42-\left(2x+32\right)=0\)
\(\Rightarrow2x+32=42\)
\(\Rightarrow2x=10\)
\(\Rightarrow x=5\)
42-(2x+32)+12:2+6
(2x+32)+6=42-6=36
2x+32=36-6=30
2x=30+32=62
x=62:2=31
tk mk nha
42 - (2x + 32) + 12 = 6.2
42 - (2x + 32) + 12 = 12
42 - (2x + 32 ) = 12 - 12
42 - (2x + 32) = 0
2x + 32 = 42 - 0
2x + 32 = 42
2x = 42 - 32
2x = 10
=> x = 10 : 2
=> x = 5
\(42-\left(2x+32\right)-12:\left(-2\right)=6\)
\(42-2x-32+12:2=6\)
\(\left(42-32+6-6\right)-2x=0\)
\(10-2x=0\)
\(x=5\)
\(\left(x-15\right):\left(-5\right)-\left(-22\right)=24\)
\(\left(x-15\right):\left(-5\right)+22=24\)
\(\left(x-15\right):\left(-5\right)=2\)
\(x-15=2\cdot\left(-5\right)\)
\(x-5=-10\)
\(x=-5\)
42−(2x+32)−12:(−2)=6
42−2x−32+12:2=6
10−2x=0
(x−15):(−5)−(−22)=24
(x−15):(−5)+22=24
(x−15):(−5)=2
x−15=2·(−5)
x−5=−10
x=−5
Bổ sung đề bài : Tính
\(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}\)
\(=\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{6.7}\)
\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}\)
\(=1-\frac{1}{7}=\frac{6}{7}\)
42-(2x+32)+12:2=6
42-2x-32+6=6
=> 42-32-2x=0
=> 10-2x=0
=>2x=10=> x=5
cái tính tổng thì theo công thức tính tổng: số đầu+số cuối)x số số hạng:2
số số hạng:(497-2):5+1=100
tổng là: 499x100:2
\(1,42-\left(2x+32\right)+12:2=6\)
\(\Rightarrow42-2x-32=0\)
\(\Rightarrow10-2x=0\)
\(\Rightarrow2x=10\Leftrightarrow x=5\)
\(2,S=2+7+12+17+...+497\)
\(\Rightarrow S=\frac{\left(497+2\right)\left[\left(497-2\right):5+1\right]}{2}\)
\(\Rightarrow S=\frac{499.100}{2}=499.50\)
\(\Rightarrow S=24950\)
\(42-\left(2x+32\right)=12:2=6\)
\(42-\left(2x+32\right)+6=6\)
\(42-\left(2x+32\right)=6-6=0\)
\(2x+32=42-0=42\)
\(2x=42-32=10\)
\(x=10:2=5\)
42-(2x+32)+12:2=6
42-(2x+32)+6 =6
42-(2x+32) =6-6
42-(2x+32) =0
2x+32 =42-0
2x+32 =42
2x =42-32
2x =10
x =10:2
x =5
nhớ kick cho mình nha