Question

Repede!!!!Dau coroana!!!!
Efectuați:
a) 201945+2019×25-70-2019=
b) (7²-3² ):2³ +[(3+2-3)²-15°):(2²×5)=
c)
(3⁵)⁴: 3¹⁸×3⁵ - 3⁷​

Answer 1

Răspuns:

Explicație pas cu pas:

a)201945+2019×25-70-2019=201 875+2019(25-1)=201 875+48,456=250331

b)(49-9):8+[(4-1):20]=40:8+3/20=5+3/20=103/20

c) 3^20:3^18×3^5-3^7=3^10-3^7=3^7(3³-1)=26×3^7

Answer 2

a)201945+2019•25-70-2019

=201945+50475-70-2019

=252420-70-2019

=252350-2019

=250331

b)(49-9):8+(2²-1):(4•5)

=40:8+3:20

=5+0,15

=5,15

$3 {}^{20} \div 3 {}^{18} \times 3 {}^{5} - 3 { }^{7} \\ = 3 {}^{2} \times 3 {}^{5} - 3 {}^{7} \\ = 3 {}^{7} - 3 {}^{7} \\ = 0$