Question

[Hoàng AimloqR~ (ɻɛɑm a hihi)]

Rút gọn biểu thức

a) x+(-10)-[87+(-41)+(-20)-x]

b)a+(250-186)-(270-186)

c)b-(393+170)+(93+170)

d) -(a-b+c)-(a+b+c)

Mong các bạn trả lời

Mik sẽ k cho ^~^

Answer 1

[Vũ Cao Minh⁀ᶦᵈᵒᶫ ( ✎﹏IDΣΛ亗 )]

a) \(x+\left(-10\right)-\left[87+\left(-41\right)+\left(-20\right)-x\right]\)

\(=x-10-\left(87-41-20-x\right)=x-10-87+41+20+x\)

\(=\left(x-x\right)+\left(20-10\right)-\left(87-41\right)=10-46=-36\)

b) \(a+\left(250-186\right)-\left(270-186\right)=a+250-186-270+186\)

\(=a+\left(250-270\right)+\left(186-186\right)=a-20\)

c) \(b-\left(393+170\right)+\left(93+170\right)=b-393-170+93+170\)

\(=b+\left(170-170\right)-\left(393-93\right)=b-300\)

d) \(-\left(a-b+c\right)-\left(a+b+c\right)=-a+b-c-a-b-c=-2a-2c\)

Answer 2

[Hoàng AimloqR~ (ɻɛɑm a hihi)]

@Vũ Cao Minh⁀ᶦᵈᵒᶫ Phèn=)

Cảm ơn nhìu lắm =)