Question

Tính hợp lí nếu vó thể

a. 55.18-5. 11.28

b. 45-5. (12+9)

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

Answer 1

Lời giải:
a)

\(55.18-5.11.28=55.18-55.28=55(18-28)=55.(-10)=-550\)

b)

\(45-5(12+9)=45-5.12-5.9=45-5.12-45=-5.12=-5.2.6=-10.6=-60\)c)

\(24(16-5)-16(24-5)=24.16-24.5-16.24+16.5\)

\(=16.5-24.5=5(16-24)=5.(-8)=-40\)

Answer 2

a. 55.18-5. 11.28

= 55.18 - 55.28

= 55.(18 - 28)

= 55. -10

= -550

b. 45-5. (12+9)

= 45 - 5.12 - 5.9

= 45 - 60 - 45

= (45 - 45) - 60

= 0 - 60

= -60

c. 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 )

= 5. (-8)

= -40

Answer 3

a.55.18-5.11.28 55.18-55.28 55.(18-28) 55.(-10) -550

Answer 4

a) 55.18-5.11.28=55.18-55.28=55.(18-28)=55.(-10)=-550

b) 45-5.(12+9)=5.9-5(12+9)=5.(9-12-9)=5.(-12)=-60

c) 24.(16-5)-16.(24-5)=24.11-16.19=4.6.11-4.4.19=4.(66-76)=4.(-10)=-40