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\(\frac{254x399-145}{254+399x\left(254+1\right)}\)
\(=\frac{254x399-145}{254+399x254+399}\)
\(=\frac{-145}{254+399}\)
\(=\frac{-145}{653}\)
\(\frac{254.399-145}{254+399.253}=\frac{\left(253+1\right).399-145}{254+399.253}=\frac{253.399+\left(399-145\right)}{254+399.253}\)
\(=\frac{253.399+254}{254+399.253}=1\)
\(\frac{254\times399-145}{254+399\times253}\)
\(=\frac{253\times399+399-145}{254+399\times253}\)
\(=\frac{253\times399+254}{254+399\times253}\)
\(=1\)
(254 x 399 - 145) / (254 + 399 x 255)
=[( 253+1) x 399 -145]/(254 + 399 x 255)
=( 253 x 399 + 399 -145) /(254 + 399 x 255)
=(254 + 399 x 255)/(254 + 399 x 255)
=1
(254 x 399 - 145) / (254 + 399 x 255)
=[( 253+1) x 399 -145]/(254 + 399 x 255)
=( 253 x 399 + 399 -145) /(254 + 399 x 255)
=(254 + 399 x 255)/(254 + 399 x 255)
=1
254 × 399 - 145 / 254 + 399 × 253
= (253 + 1) × 399 - 145 / 254 + 399 × 253
= 253 × 399 + (399 - 145) / 254 + 399 × 253
= 253 × 399 + 254 / 254 + 399 × 253
= 1
\(\frac{254x399-145}{254+399x253}\)
\(=\frac{253x399+399-145}{254+399x253}\)
\(=\frac{253x399+254}{254+399x253}=1\)
\(\frac{254\cdot399-145}{254+399\cdot253}=\frac{\left(253+1\right)\cdot399-145}{254+399\cdot253}\)
\(=\frac{253\cdot399+399-145}{254+399\cdot253}\)
\(=\frac{253\cdot399+254}{254+399\cdot253}\)
\(=1\)
a) \(\frac{254.399-145}{254+399.253}\)
\(=\frac{253.399+399-145}{254+399.253}\)
\(=\frac{253.399+254}{254+399.253}\)
\(=1\)
b) tự làm
\(\frac{254.399-145}{254+399.253}\)
\(=\frac{253.399+399-145}{254+399.253}\)
\(=\frac{253.399+254}{254+399.253}=1\)
254 x399 - 145 / 254 + 399 x 255
= ( 253 + 1 ) x 399 - 145 / 254 + 399 x 255
= 253 x 399 + ( 399 - 145 )/ 254 + 399 x 255
= 254 x 399 + 255 / 254 + 399 x 155
= 1