Question

tính hợp lý nếu có thể

a) 2.25.9.4

b)35.112-12.35+50

c)16+(5¹⁶ : 5¹⁴ - 9⁰)

d) 24.7 - [181 - ( 13 - 4)² ]

Answer 1

a: \(2\cdot25\cdot9\cdot4=25\cdot4\cdot9\cdot2=18\cdot100=1800\)

b: \(35\cdot112-12\cdot35+50\)

\(=35\left(112-12\right)+50\)

=3500+50

=3550

c: \(16+\left(5^{16}:5^{14}-9^0\right)\)

\(=16+5^2-1\)

=25+15

=40

d: \(24\cdot7-\left[181-\left(13-4\right)^2\right]\)

\(=168-181+9^2\)

=81-13

=68

Answer 2

a)2.25.9.4

=(25.4).(9.2)

=100.18

1800

b)35.112-12.35+50

=35.(112-12)+50

=35.100+50

=3500+50

=3550

c)\(16+\left(5^{16}:5^{14}-9^0\right)\)

\(=16+\left(5^2-9^0\right)\)

\(=16+\left(25-1\right)\)

\(=16+24\)

\(=40\)

d)\(24.7-[181-\left(13-4\right)^2]\)

\(=24.7-[181-9^2]\)

\(=24.7-[181-81]\)

\(=24.7-100\)

\(=168-100\)

\(=68\)