x=250-100

x=150

100:2.5

=50.5

=250

x+100=250

x=250-100

x=150

 k mk nha mk đang âm điểm

a,6x²+23x-18

=6x²+27x-4x-18

=(6x²+27x)-(4x+18)

=3x(2x+9)-2(2x-9)

=(3x-2)(2x+9)

24 quả mận 

nhớ tích cho minh nha

\(x+3x\div2=0,75\)

\(\left(x+3x\right)=0,75\cdot2\)

\(1x+3x=1,5\)

\(4x=1,5\)

\(x=1,5\div4\)

\(x=0,375\)

24 quả mận

\(\frac{123456789}{3}=41152263\)

Từ a²+b²+c²=14 =>(a²+b²+c²)²=196

=>a⁴+b⁴+c⁴+2a²b²+2b²c²+2a²c²=196

=>T=a⁴+b⁴+c⁴=196-2(a²b²+b²c²+a²c²)

Từ a+b+c=0 =>(a+b+c)²=0

=>a²+b²+c²+2(ab+bc+ac)=0

\(\Rightarrow ab+bc+ac=\frac{-\left(a^2+b^2+c^2\right)}{2}=\frac{-14}{2}=-7\)

=>(ab+bc+ac)²=49

=>a²b²+b²c²+a²c²=49-2abc(a+b+c)=49 (Vì a+b+c=0)

Vậy T=196-2*49=196-98=98

\(5^4.5^2=5^{4+2}=5^6\)