\(\frac{254\cdot399-145}{254+399\cdot253}=\frac{\left(253+1\right)\cdot399-145}{254+399\cdot253}\)
\(=\frac{253\cdot399+399-145}{254+399\cdot253}\)
\(=\frac{253\cdot399+254}{254+399\cdot253}\)
\(=1\)
\(\frac{254\cdot399-145}{254+399\cdot253}=\frac{\left(253+1\right)\cdot399-145}{254+399\cdot253}\)
\(=\frac{253\cdot399+399-145}{254+399\cdot253}\)
\(=\frac{253\cdot399+254}{254+399\cdot253}\)
\(=1\)
tính nhanh
254x399-145
___________
254+399x253
\(\frac{254x399-145}{254+399x253}\)
b2 tính nhanh
254x399-145 / 254+399x253
Tính nhanh:
\(\frac{254x399-145}{254+399x253}\)
Tính nhanh:
\(\frac{254x399-145}{254+399x253}\)
tính nhanh
a.\(\frac{254x399-145}{254+399x253}\)
b. \(\frac{5932x6001x5931}{5932x6001-69}\)
58x42+32x8+5x16
456:2 x 18 +456:3 -102
(254x399-145) : (254+399x253)
(5932 + 6001 x 5931) : ( 5932 x 6001 - 69)
Bài 6: Tính nhanh:
a) \(\dfrac{254x399-145}{254+399x253}\) ( x ở trong bài này là nhân ạ)
b) \(\dfrac{5932+6001x5931}{5932x6001-69}\)
c) \(\dfrac{1}{2}\) + \(\dfrac{1}{4}\) + \(\dfrac{1}{8}\) + \(\dfrac{1}{16}\) + \(\dfrac{1}{32}\)
tính nhanh
254x399-145 / 254+399x253 5932+6001x5931 / 5932x6001-69