\(2^3-5^3:5^2+12\cdot2^2=8-5+48=51\\ 5\left[\left(85-35:7\right):8+90\right]-5\cdot2^2\\ =5\left(80:8+90\right)-20=5\cdot100-20=480\)

85+(-35)+(-12)+(-35)=50+(-12)+(-35)=38+(-35)=3
5³.4²+85.5³-5⁷:5⁴=125.16+85.125-5³=125.16+85.125-125
=125.16+85.125-125.1=(16+85-1).125=100.125=12500
 

[(85 - 5) : 2³ + 5²] . 2 - 40

= (80 : 8 + 25) . 2 - 40

= (10 + 25) . 2 - 40

= 35 . 2 - 40

= 70 - 40

= 30

[(85 - 5) : 2³ + 5²] . 2 - 40

= (80 : 8 + 25) . 2 - 40

= (10 + 25) . 2 - 40

= 35 . 2 - 40

= 70 - 40

= 30

[(85 - 5) : 2³ + 5²] . 2 - 40

= (80: 8 + 25) . 2 - 40

= (10 + 25) . 2 - 40

= 35 . 2 - 40

= 70 - 40

= 30

Làm đc bài này tui chết lìn

1 + 1 * 2 * 2 * 25 * 5 * 6 * 79 * 79 * 85 * 85 * 85 * 444444 * 65487 = 334660424517740821500001

ủng hộ mk nha các bn

chết đi Ran Mori

2 . [ { 7 -3 mũ 3 : 3 mũ 2 } : 2 mũ 2 + 99 ] - 100

b: \(5\cdot\left[\left(85-35:7\right):8+90\right]-5^2\cdot2\)

\(=5\cdot\left[\left(85-5\right):8+90\right]-25\cdot2\)

\(=5\cdot\left(10+90\right)-50\)

=450

\(\text{a, Ta có:}\)

\(3\sqrt{7}=\sqrt{3^27}=\sqrt{63}\)

\(9=\sqrt{81}\)

\(\text{Vì}:\sqrt{81}>\sqrt{63}\Rightarrow3\sqrt{7}< 9\)

\(\text{b, Vì}\) \(-\sqrt{3}>-\sqrt{5}\Rightarrow-\sqrt{\sqrt{3}}>-\sqrt{\sqrt{5}}\)

\(c,\sqrt{51}-\sqrt{3}\approx5,4>5\)

\(d.\text{Vì}\) \(5>\sqrt{5}\Rightarrow\sqrt{85+5}>\sqrt{85+\sqrt{5}}\)

b: \(\left[\left(6+\dfrac{3}{5}-3-\dfrac{3}{14}\right)\cdot\dfrac{2}{5}\right]:\left(21-1.25\right)=x:\left(5+\dfrac{5}{6}\right)\)

\(\Leftrightarrow x:\dfrac{35}{6}=\dfrac{237}{175}:\dfrac{79}{4}\)

\(\Leftrightarrow x:\dfrac{35}{6}=\dfrac{12}{175}\)

\(\Leftrightarrow x=\dfrac{2}{5}\)

óla 246 do

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