Question

tính hợp lý

35.18-5.7.28

45-5.(12+9)

24.(16-5)-16.(24-5)

 

 

Answer 1

   35.18-5.7.28

=35 .18-35.28

=35.(18-28)

=35.(-10)

= -350

   45-5.(12+9)

=45-5.12-5.9

=5.9-5.12-5.9

=5.(9-12-9)

=5.(-12)

=-60

  24.(16-5)-16.(24-5)

=24.16-24.5-16.24+16.5

= (24.16-16.24)-(24.5-16.5)

=           0       -   5.(24-16)

=           0       -   5.8

=           0       -   40

=                 -40

Answer 2

35.18-5.7.28

=35.18-35.28

=35.(18-28)

=35.(-10)

=-350

45-5.(12+9)

=5.9-5.12-5.9

=0-60

=-60

24.(16-5)-16.(24-5)

=24.16-24.5-16.24+16.5

=(24.16-16.24)+(24.5+16.5)

=0-5.(24-16)

=0-5.8

=0-40

=-40

Answer 3

A=35.18-35.28 =35.(18-28)=35.(-10)=-350

B=45-5.21=45-105=-60

C=-40

K NHA

Answer 4

35.18-5.7.28=35.18-35.28=35.(18+28)=35.46=1610

45-5.(12+9)=5.9-5.21=5.(9-21)=5.(-11)=-55

24.(16-5)-16.(24-5)=24.16-24.5-16.24-16.5=(24.16-16.24)+(24.5-16.5)=24.5-16.5=5.(24-16)=5.8=40

mk nha :)