Cho biểu thức sau
1/2-1/3.7-1/7.11-1/11.15-1/15.19-1/19.23-1/23.27
Làm ơn giải giúp mình với
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
-2x + 0,25 = -x - 0,5
0,25 + 0,5 = -x + 2x
0,75 = x
Vậy x = 0,75
-2x + 0,25 = -x-0,5
-2x + x = -0,5 - 0,25
-x = -0,75
x = 0,75
Vậy x = 0,75
Số tiền mẹ An phải trả là:
(8000000 + 300000) x (100% - 20%) = 6640000 (đồng)
\(\dfrac{2}{5}x-\dfrac{1}{5}=-0,6\\ =>\dfrac{2}{5}x-\dfrac{1}{5}=-\dfrac{3}{5}\\ =>\dfrac{2}{5}x=-\dfrac{3}{5}+\dfrac{1}{5}\\ =>\dfrac{2}{5}x=-\dfrac{2}{5}\\ =>x=-\dfrac{2}{5}:\dfrac{2}{5}\\ =>x=-1\)
2/5x - 1/5 = -0,6
2/5x - 1/5 = -3/5
2/5x = -3/5 + 1/5
2/5x = -2/5
x = -2/5 : 2/5
x = -10/10 = -1
A = \(\dfrac{1}{2}\) - \(\dfrac{1}{3.7}\) - \(\dfrac{1}{7.11}\) - \(\dfrac{1}{11.15}\) - \(\dfrac{1}{15.19}\) - \(\dfrac{1}{19.23}\) - \(\dfrac{1}{23.27}\)
A = \(\dfrac{1}{2}\) - ( \(\dfrac{1}{3.7}\) + \(\dfrac{1}{7.11}\) + \(\dfrac{1}{11.15}\) + \(\dfrac{1}{15.19}\) + \(\dfrac{1}{19.23}\) + \(\dfrac{1}{23.27}\))
A = \(\dfrac{1}{2}\) - \(\dfrac{1}{4}\).( \(\dfrac{4}{3.7}\) + \(\dfrac{4}{7.11}\) + \(\dfrac{4}{11.15}\) + \(\dfrac{4}{15.19}\) + \(\dfrac{4}{19.23}\) + \(\dfrac{4}{23.27}\))
A = \(\dfrac{1}{2}\) -\(\dfrac{1}{4}\) .( \(\dfrac{1}{3}\) - \(\dfrac{1}{7}\) + \(\dfrac{1}{7}\) - \(\dfrac{1}{11}\)+ \(\dfrac{1}{11}\)- \(\dfrac{1}{15}\) +\(\dfrac{1}{15}\)-\(\dfrac{1}{19}\) +\(\dfrac{1}{19}\) - \(\dfrac{1}{23}\) + \(\dfrac{1}{23}\) - \(\dfrac{1}{27}\))
A = \(\dfrac{1}{2}\) - \(\dfrac{1}{4}\). ( \(\dfrac{1}{3}\) - \(\dfrac{1}{27}\))
A = \(\dfrac{1}{2}\) - \(\dfrac{1}{4}\). \(\dfrac{8}{27}\)
A = \(\dfrac{1}{2}\) - \(\dfrac{2}{27}\)
A = \(\dfrac{23}{54}\)