C) 2².[5³:25+(6:2)]

D) (6.5² -13.7).2 -2³.(7+3)

2)

A) x³=343

B) x³=125

C) x¹=1024

D)x³=64

E) (x+1)=125

F)(x-2)³=8

G)x=10000

H) (x -1)=16

Đáp án:

 

Giải thích các bước giải:

C) 2^2.[ 5^3.25+(6:2)]

=4.[125.25+3]

=4.[3125+3]

=4.3128

=12512

D) (6.5^2-13.7).2-2^3.(7+3)

=(6.25-13.7).2-8.(7+3)

=(150-91).2-8.10

=59.2-8.10

=118-80

=38

2)

A) x^3=343

=>x^3=7^3

=>x=7

B)x^3=125

=>x^3=5^3

=>x=5

C) x^1=1024

=>x^1=1024^1

=>x=1024

D)x^3=64

=>x^3=4^3

=>x=4

E) (x+1)=125

x=125-1

x=124

H) (x-1)=16

x=16+1

x=17