Question

tính nhanh 

a ) 4 x 2 x 4 x 3 + 4 x 4 + 4

b ) 5 x 23 - 5 x 2 - 5 x 3 - 5 x 4 - 5 x 5 + 5

 

Answer 1

a)   4 x 2 + 4 x 3 + 4 x 4 + 4 

   = 4 x ( 2 + 3 + 4 + 1 )

   = 4 x 10

   = 40

b)   5 x 23 - 5 x 2 - 5 x 3 - 5 x 4 - 5 x 5 + 5

   = 5 x ( 23 - 2 - 3 - 4 - 5 + 5 )

   = 5 x 14

   = 70

Answer 2

a)4x(1+2+3+4)

=4x10

=40

b)5x23—5x2—5x3—5x4—5x5+5

=5x(23—2—3—4—5+1)

=5x10

=50

Answer 3

a) 4 x 2 x 4 x 3 + 4 x 4 + 4

= 4 x ( 1 + 2 + 3 + 4 )

= 4 x 10

= 40

b) 5 x 23 - 5 x 2 - 5 x 3 - 5 x 4 - 5 x 5 + 5

= 5 x ( 23 - 2 - 3 - 4 - 5 + 1 )

= 5 x 10

= 50

Đ/s: ... 

Answer 4

a ) 4 x 2 x 4 x 3 + 4 x 4 + 4 = 4 x 10

                                            = 40

b ) 5 x 23 - 5 x 2 - 5 x 3 - 5 x 4 - 5 x 5 + 5 = 5 x 10

                                                                  = 50

Answer 5

a) 4 x 2 x 4 x 3 + 4 x 4 + 4

= 4 x ( 1 + 2 + 3 + 4 )

= 4 x 10

= 40

b) 5 x 23 - 5 x 2 - 5 x 3 - 5 x 4 - 5 x 5 + 5

= 5 x ( 23 - 2 - 3 - 4 - 5 + 1 )

= 5 x 10

= 50

Answer 6

a) 4 x 2 x 4 x 3 + 4 x 4 + 4

= 4 x ( 1 + 2 + 3 + 4 )

= 4 x 10

= 40

b) 5 x 23 - 5 x 2 - 5 x 3 - 5 x 4 - 5 x 5 + 5

= 5 x ( 23 - 2 - 3 - 4 - 5 + 1 )

= 5 x 10

= 50

hok tốt