Question

B1: Tính bằng cách hợp lí:

A. 125x 16x7 x5

B. 51x 43 x51 x69 -51 x18

C. 15 x (467+ 13)+ 75 x(427 +53)

D. (195+196+197+…+2000) x(52 x364-208 x91)

E. 9 x17 x4 +38 x2 x18+3 x45 x12

H. 52 x37 -24

     52 x36 +28

Answer 1

a, 125 x7x( 16x5)

=875x80

=70,000

b,51x43+51x69-51x18

=51x (43+69-18)

=51x94

=4794

c,15x(467+13)+75x(427+53)

=480x(15+75)

=480x90

=43200

d, (195+196+197+....+2000)x(52x364-208x91)

=(195+196+.......+2000)x0

=0

Chúc bạn học tốt

Answer 2

a.125x7x(16x5)=875x80=70000

b. 51x43+51x69-51x18= 51x(49+69-18)=51x94=4791

c. 15x(467+13)+75x(427+53)= 15x480+75x480=480x(15+75)= 480x90=43200

d. (195+196+197+...+2000)x(52x364-208x91)=(195+196+...+2000)x0=0