100×4+250
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\(=100:\left[250-450+4\cdot125-8\cdot25\right]\\ =100:\left[-250+500-200\right]=100:50=2\)
\(4^{250}=\left(2^2\right)^{250}=2^{500}=\left(2^5\right)^{100}=32^{100}\)
Vì \(32^{100}>25^{100}\)nên \(4^{250}>25^{100}\)
\(d,100:\left\{250:\left[450-\left(4.53-22.25\right)\right]\right\}\)
\(100:\left\{250:\left[450-\left(4.5^3-3^2.25\right)\right]\right\}\)
\(100:\left\{250:\left[450-175\right]\right\}\)
\(100:\left\{250:275\right\}\)
\(=100:\dfrac{10}{7}\)
\(=100.\dfrac{7}{10}\)
\(=70\)
a) \(\dfrac{7}{4}\text{⇔}1\dfrac{3}{4}\text{⇔}1,75\text{⇔}\dfrac{175}{100}\text{⇔}175\%\)
b) \(\dfrac{12}{5}\text{⇔}2\dfrac{2}{5}\text{⇔}2,4\text{⇔}\dfrac{240}{100}\text{⇔}240\%\)
100:{250:[450-(4 . 53-22 . 25 ] }
=100:{250:[450-(500-100)])
=100:{250:[450-400])
=100:{250:50}
=100:5
=20
100*4+250
=400+250
=650
100 * 4 + 250
= 400 + 250
= 650