a) Ta có: \(\left|x\right|-\left(-9\right)^3=-100\)
\(\Leftrightarrow\left|x\right|-\left(-729\right)=-100\)
\(\Leftrightarrow\left|x\right|+729=-100\)
\(\Leftrightarrow\left|x\right|=-100-729=-829\)(vô lý)
Vậy: \(x\in\varnothing\)
b) Ta có: \(3x-\left(-10\right)=2x+50\)
\(\Leftrightarrow3x+10-2x-50=0\)
\(\Leftrightarrow x-40=0\)
\(\Leftrightarrow x=40\)
Vậy: x=40
giúp mình với
9x-2(x-29)=-47
2x-5(x+3)=-75
3x-14=2(x-9)+1
Cho x = - 75 , a = 50 , b = - 15
Rút gọn các biểu thức sau rồi tính giá trị :
a) x + 10 - x - 25 c) -b + a + 9 - 7 +b
b) -x + a + 15 - a d) b - 25 + x + 25 - x
b) 25 +5(x - 3) = 75
c) 2x- 5 - 7= 9
Tìm x
2x-3=x+\(\frac{1}{2}\)
4x-(2x+1)=3-\(\frac{1}{3}\) +x
Tính
a \(\frac{1}{1\cdot4}\) +\(\frac{1}{4\cdot7}\) +\(\frac{1}{7\cdot10}\) +....+\(\frac{1}{100\cdot103}\)
b \(\frac{8}{9}\) -\(\frac{1}{72}\) -\(\frac{1}{56}\) -\(\frac{1}{42}\) -....-\(\frac{1}{6}\) -\(\frac{1}{2}\)
3x-3=9
1) x+1/2=-5/3
2) 1/3-x=3/5
4) x-4/3=-7/9
5) x--7/3=5/6
6) x-1/5=9/10
7) x+5/12=3/8
8) x+5/4=7/6
9) x-2/7=1/35
10) x-2/7=-7/10
tính tổng :
1: 1+(-2)+3+(-4)+........+19+(-20)
2: 1- 2 +3 -4+......+99 - 100
3: 2 - 4+6 - 8+.....+48 - 50
4: -1 + 3 - 5 +7 -.....+97 - 99
5: 1 + 2 - 3 - 4 +.....+97 + 98 - 99 - 100
xy+14+2y+7x=-10
xy+5x+y=4
xy+x+y=2
xy-10+5x-3y=2
xy-1=3x+5y+4
3x+4y-xy=15
Tìm x:
a) \(\left|x-2\right|=3\)
\(\left|x-1\right|>1\)
\(2< \left|x\right|< 5\)
b) \(-x.\left(x+3\right)=0\)
\(\left(x-2\right).\left(3x-9\right)=0\)
P/s: Giusp với
