Question

Tính bằng cách thuận tiện nhất :

a)425-84-16

b)821-73-27-21

c)475-(75-36)

d)573-(73-24)

Answer 1

a)425-84-16=425-(84+16)=425-100=325.

b)821-73-27-21=(821-21)-(73+27)=800-100=700.

c)475-(75-36)=(475-75)+36=400+36=436.

d)573-(73-24)=(573-73)+24=500+24=524.

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Answer 2

a) 425 - 84  - 16

= 425 - (84 + 16)

= 425 - 100

= 325

b) 821 - 73 - 27 - 21

= (821 - 21) - (73 + 27)

= 800 - 100

= 700

c) 475 - (75 - 36)

= 475 - 75 + 36

= 400 + 36

= 436

d) 573 - (73 - 24)

= 573 - 73 + 24

= 500 + 24

= 524

Answer 3

a) 425 - 84 - 16 = 425 - ( 84 + 16 ) = 425 - 100 = 325

b) 821 - 73 - 27 - 21 = ( 821 - 21 ) - ( 73 + 27 ) = 800 - 100 = 700

c) 475 - ( 75 - 36 ) = 475 - 75 + 36 = ( 475 - 75) + 36 = 400 + 36 = 436

d) 573 - ( 73 - 24 ) = 573 - 73 + 24 = ( 573 - 73 ) + 24 = 500 + 24 = 524

Answer 4

a)425-84-16=425-(84+16)=425-100=325

b)821-21-(73+27)=800-100=700

c) (475-75)-36=400-36=364

d) (573-73)-24=500-24=476