a/ \(58.75+58.50-58.25\)
\(=58\left(75+50-25\right)\)
\(=58.100\)
\(=5800\)
b/ \(20\div2^2-5^9\div5^8\)
\(=20\div4-5\)
\(=5-5\)
\(=0\)
c/ \(\left(5^{19}\div5^{17}-4\right)\div7\)
\(=\left(5^2-4\right)\div7\)
\(=\left(25-4\right)\div7\)
\(=21\div7\)
\(=3\)
a.58.75+58.50-58.25
=58.(75+50+25)
=58.150
=8700
b, 20:2^2-5^9:5^8
=20:4 -5
=5-5
=0
c, (5^19:5^17-4);7
=(5^2 -4):7
=(25-4):7
=21:7
=3
a) 58 . 75 + 58 . 50 - 58 . 25
= 58 (75 + 50 - 25)
= 58 . 100
= 5800
b) 20 : 22 - 59 : 58
= 20 : 4 - 59-8
= 20 : 4 - 51
= 5 - 5
= 0
c) (519 - 517 - 4) : 7
= (519-17 - 4) : 7
= (52 - 4) : 7
= (25 - 4) : 7
= 21 : 7
= 3
