Bài làm

x.(124124/125125-1)=2/5:(-1/21:-1/4242)

x.(124124/125125-1)=2/5:202/1

x.(-1/125125)            =1/505

x                                =1/505:-1/125125

x                                =25025/101

=>x-128=(104/21-5):(41/42-1):(63/64-1)

=>\(x-128=\dfrac{-1}{21}:\dfrac{-1}{42}:\dfrac{-1}{64}=\dfrac{-42\cdot64}{21}=-2\cdot64=-128\)

=>x=0

(4242:21)x100=20,200

các bạn tick cho mình nha!!!

(4242:100)x21=890,82

tick mình nha Phan Nguyễn Bảo Châu!!!

\(x-180=\left(4\dfrac{20}{21}-5\right):\left(\dfrac{4141}{4242}-1\right):\left(\dfrac{636363}{646464}-1\right)\)

\(\Rightarrow x-180=\left(\dfrac{104}{21}-5\right):-\dfrac{1}{42}:-\dfrac{1}{64}\)

\(\Rightarrow x-180=-\dfrac{1}{21}:-\dfrac{1}{42}:-\dfrac{1}{64}\)

\(\Rightarrow x-180=-\dfrac{1}{21}\cdot-42:-\dfrac{1}{64}\)

\(\Rightarrow x-180=2\cdot-64\)

\(\Rightarrow x-180=-128\)

\(\Rightarrow x=-128+180\)

\(\Rightarrow x=52\)

Phân số ở đuôi không chính xác. Bạn viết lại đề chuẩn để mọi người hỗ trợ tốt hơn.

x - 128 = \(\left(4\dfrac{20}{21}-5\right):\left(\dfrac{4141}{4242}-1\right):\left(\dfrac{636363}{646464}-1\right)\)

⇔ x - 128 = \(\left(\dfrac{104}{21}-5\right):\left(\dfrac{-1}{42}\right):\left(\dfrac{-1}{64}\right)\)

⇔ x - 128 = \(\left(\dfrac{-1}{21}\right):\left(\dfrac{-1}{42}\right):\left(\dfrac{-1}{64}\right)\)

⇔ x - 128 = -128

⇔ x = -128 + 128

⇔ x = 0

Vậy x = 0

\(x-128=\left(4\dfrac{20}{21}-5\right):\left(\dfrac{4141}{4242}-1\right):\left(\dfrac{636363}{646464}-1\right)\)

\(\Rightarrow x-128=\left(-\dfrac{1}{21}\right):\left(-\dfrac{1}{42}\right):\left(-\dfrac{1}{64}\right)\)

\(\Rightarrow x-128=2:\left(-\dfrac{1}{64}\right)\)

\(\Rightarrow x-128=-128\)

\(\Rightarrow x=\left(-128\right)+128\)

\(\Rightarrow x=0\)

x-128=-128(cái này tự ấn máy tính nha viết hết ra lâu lắm)

x=-128+128

x=0

ko biết đúng ko nữa nếu đúng thì tick cho mình nha