5 [(85-35:7) :2 mũ3 + 3 mũ 2 .10] -50
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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
\(2^3-5^3:5^2+12\cdot2^2=8-5+48=51\\ 5\left[\left(85-35:7\right):8+90\right]-5\cdot2^2\\ =5\left(80:8+90\right)-20=5\cdot100-20=480\)
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
\(5\left[\left(85-35:7\right):2^3+3^2.10\right]-50\)
\(=5\left[\left(85-5\right):8+9.10\right]-50\)
\(=5\left[80:8+90\right]-50\)
\(=5\left[10+90\right]-50\)
\(=5.100-50\)
\(=500-50\)
\(=450\)
5.[ (85-35:7):2^3+3^2.10 ] - 50
=5.[(85-5):8+9.10 ]-50
=5.[80:8+9.10]-50
=5.[10+90]-50
=5.100-50
=5.2.50-50
=10.50-50.1
=50.(10-1)
=50.9
=450