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ta co 3 truong hop
truong hop 1
x-1=0
x=0+1
x=1
truong hop 2
x+2=0
x=0-2
x=-2
truong hop 3
x-3=0
x=0-3
x=-3
mik chac chan dung nha
TA CÓ 3 TRƯỜNG HỢP XẢY RA
TH1:X-1=0
X =0+1
X =1
TH2:X+2=0
X =0-2
X =-2
TH3 :X-3=0
X =0+3
X =3
VẬY X {1;-2;3}
CHẮC CHẮN 100% K NHA
\(96-3\left(x+1\right)=42\)
\(3\left(x+1\right)=96-42\)
\(\left(x+1\right)=54:3\)
\(x=18-1\)
\(x=17\)
\(\left(\frac{10}{99}+\frac{11}{199}-\frac{12}{299}\right)\times\left(\frac{1}{2}-\frac{1}{3}+-\frac{1}{6}\right)\)
\(=\left(\frac{10}{99}+\frac{11}{199}-\frac{12}{299}\right)\times\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)\)
\(=\left(\frac{10}{99}+\frac{11}{199}-\frac{12}{299}\right)\times\left(\frac{3}{6}-\frac{2}{6}-\frac{1}{6}\right)\)
\(=\left(\frac{10}{99}+\frac{11}{199}-\frac{12}{299}\right)\times0\)
\(=0\)
13 - l x + 5 l = 13
\(\Rightarrow\)l x + 5 l = 13 -13
\(\Rightarrow\)l x + 5 l = 0
\(\Rightarrow\)x + 5 = 0
\(\Rightarrow\)x = 0 - 5
\(\Rightarrow\)x = -5
Ta có: 13 - | x + 5 | = 13
\(\Rightarrow\left|x+5\right|=13-13\)
\(\Rightarrow\left|x+5\right|=0\Rightarrow x+5=0\)
\(\Rightarrow x=-5\)
Chúc bạn học tốt
1. (7.x-15):3=2 2. 12.(x+37)=504 3. 85-3.(7+x)=64
7.x-15=2.3 x+37=504:12 3.(7+x)=85-64
7.x-15=6 x+37=42 3.(7+x)=21
7.x=6+15 x=42-37 7+x=21:3
7.x=21 x=5 7+x=7
x=21:7 x=7-7
x=3 x=0
1. (7.x-15):3 = 2
(7.x-15)=2.3
(7.x-15)=6
7x=15+6
7x=21
x=21:7
x=3
2.12.(x+37=504
x+37=504:12
x+37=42
x = 42-37
x=5
3. 85-3.(7+x)=64
3.(7+x)=85-64
3.(7+x)=21
7+x=21:3
7+x=7
x=7-7
x=0
A = 1 x 2 + 2 x 3 + 3 x 4 + ...+ 41 x 42 + 42 x 43
A = \(\dfrac{1}{3}\) x (1 x 2 x 3 + 2 x 3 x 3 + ... + 42 x 43 x 3)
A = \(\dfrac{1}{3}\) x [1 x 2 x 3 + 2 x 3 x (4 - 1)+ ... + 42 x 43 x (44 - 41)]
A = \(\dfrac{1}{3}\) x [1 x 2 x 3 + 2 x 3 x 4 -1 x 2 x 3+...+ 42 x 43 x 44 - 42x43x41]
A = \(\dfrac{1}{3}\) x [42 x 43 x 44]
A = \(\dfrac{42}{3}\) x 43 x 44
A = 14 x 43 x 44
A = 602 x 44
A = 26488
co oi cho con hoi 1 phan 3 lay o dau a