Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
B) 2x + (-416) - (231 - 416 )
= 2x - 416 - 231 + 416
= 2x - ( 416 +231 - 416 )
= 2x - 231
D) 211-(123-x)+(123-211)
= 211 - 123 + x + 123 - 211
= ( 211 - 123 +123 - 211 )+ x
= 0+ x
= x
b) 2x + (-461) - (231 - 416)
= 2x - 461 - (231 - 416)
= 2x - 461 + 185
= 2x - 276
d) 211 - (123 - x) + (123 - 211)
= 211 - 123 + x + 123 - 211
= (211 - 211) + (-123 + 123) + x
= 0 + 0 + x
= x
a: \(A=\dfrac{63-48-70}{84}:\dfrac{-3\cdot84+4\cdot60+5\cdot70}{840}\cdot\dfrac{1-14}{12}\)
\(=\dfrac{-55}{84}\cdot\dfrac{840}{338}\cdot\dfrac{-13}{12}=\dfrac{55}{1}\cdot\dfrac{10}{338}\cdot\dfrac{13}{12}=\dfrac{275}{156}\)
b: \(=-234\cdot123+123\cdot4356-123\cdot2312+234\cdot123-234\cdot2312+2312\cdot234+2312\cdot123\)
\(=123\cdot4356-123\cdot2312+123\cdot2312=123\cdot4356=535788\)
\(\left(\frac{377}{-213}-\frac{123}{89}+\frac{34}{791}\right).\left(\frac{1}{6}-\frac{1}{8}-\frac{1}{24}\right)\)
\(=\left(\frac{377}{-213}-\frac{123}{89}+\frac{34}{791}\right).0\)
\(=0\)
(377/-213 - 123/89 +34/791 ). (1/6 - 1/8 - 1/24).
=(377/-213 - 123/89+34/791). 0
= 0
\(a,\left(\frac{2}{5}\right)^6.\left(\frac{25}{4}\right)^2=\left(\frac{2}{2.3}\right)^6.\left(\frac{5}{2}\right)^4\)
\(=\frac{1}{3^6}.\frac{5^4}{2^4}=\frac{5^4}{3^6.2^4}\)
\(b,\frac{100}{123}:\left(\frac{3}{4}+\frac{7}{12}\right)+\frac{23}{123}:\left(\frac{9}{5}-\frac{7}{15}\right)\)
\(=\frac{100}{123}:\left(\frac{9+7}{12}\right)+\frac{23}{123}:\left(\frac{27-7}{15}\right)\)
\(=\frac{100}{123}:\frac{16}{12}+\frac{23}{123}:\frac{20}{15}\)
\(=\frac{100.12}{123.16}+\frac{23.15}{123.20}\)
\(=\frac{5.5.4.3.4}{41.3.4.4}+\frac{23.3.5}{41.3.4.5}\)
\(=\frac{25}{41}+\frac{23}{164}=\frac{25.4+23}{164}\)
\(=\frac{123}{164}=\frac{3}{4}\)
\(0,\left(41\right)=\frac{41}{99}\)
\(0,\left(123\right)=\frac{123}{999}\)
`6,(123) =` \(\dfrac{2039}{333}\)
\(6,\left(123\right)=6+0,\left(123\right)=6+\dfrac{123}{999}=\dfrac{2039}{333}\)