a) 5 ² . 2 ³ 3 ². 7-8 ² .2 b) (5.2 ² -20):53 ² .6 c) (6.5 ² - 13.7) .2-2 ³ .(73) d) (24.5 - 5 ².2) : (5.2)-3 e) [( 5 ². 2

Question

a) 5 ² . 2 ³ +3 ². 7-8 ² .2 b) (5.2 ² -20):5+3 ² .6 c) (6.5 ² - 13.7) .2-2 ³ .(7+3) d) (24.5 - 5 ².2) : (5.2)-3 e) [( 5 ². 2 ³ -7 ² .2) :2]. 6-7.25

bichhhathu · Answer

Giải đáp: + Lời giải và giải thích chi tiết:

a,

5^2*2^3+3^2*7-8^2*2

=25*8+9*7-64*2

=200+63-128

=263-128

=135

b,

(5*2^2-20):5+3^2*6

=(5*4-20):5+9*6

=(20-20):5+9*6

=0:5+9*6

=0+54

=54

c,

(6*5^2- 13*7)*2-2^3*(7+3)

=(6*25-13*7)*2-2^3*(7+3)

=(150-91)*2-2^3*(7+3)

=59*2-2^3*10
=59*2-8*10
=118-80

=38

d,

(24*5 – 5^2*2) : (5*2)-3

=(24*5- 25*2) : (5*2)-3

=(120- 50) :10-3
=70:10-3
=7-3
=4
e,

[( 5^2*2^3 -7 ^2*2) :2]*6-7*25
=[( 25*8-49*2) :2]*6-7*25

=[(200-98) :2]*6-7*25
=[102 :2]*6-7*25
=51*6-7*25
=306-175
=131

a) 5 ² . 2 ³ +3 ². 7-8 ² .2 b) (5.2 ² -20):5+3 ² .6 c) (6.5 ² – 13.7) .2-2 ³ .(7+3) d) (24.5 – 5 ².2) : (5.2)-3 e) [( 5 ². 2