Bỏ dấu ngoặc rồi tính A (1267-196) -(267 cộng 304) B (3965-2378)-(437-1378) -528 C (2002-79 cộng 15)-(-79 cộng15) D -329-(15-101)-(25-440)
2 câu trả lời
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` a) (1267 - 196) - (267 + 304) `
` = 1267 - 196 - 267 - 304 `
` = (1267 - 267) - (196 + 304) `
` = 1000 - 500 `
` = 500 `
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` b) (3965 - 2378) - (437 - 1378) - 528 `
` = 3965 - 2378 - 437 + 1378 - 528 `
` = [3965 - (437 + 528)] - (2378 - 1378) `
` = (3965 - 965) - 1000 `
` = 3000 - 1000 `
` = 2000 `
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` c) (2002 - 79 + 15) - (-79 + 15) `
` = 2002 - 79 + 15 + 79 - 15 `
` = 2002 + (79 - 79) + (15 - 15) `
` = 2002 `
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` d) -329 - (15 - 101) - (25 - 440) `
` = -329 - 15 + 101 - 25 + 440 `
` = (-329 + 101) + (-15 - 25 + 440) `
` = -228 + 400 `
` = 172 `
a. (1267 - 196) -(267 + 304)
= 1267 - 196 - 267 - 304
= 1267 - 267 - (196 + 304 )
= 1000 - 500
= 500
.
b. ( 3965 - 2378 ) - ( 437 - 1378 ) - 528
= 3965 - 2378 - 437 + 1378 - 528
= ( 3965 - (437 + 528 ) - ( 2378 - 1378 )
= 3000 - 1000
= 2000
.
c. ( 2002 - 79 + 15 ) - ( -79 + 15 )
= 2002 - 79 + 15 + 79 - 15
= 2002 + ( -79 + 79 ) + ( 15 - 15 )
= 2002 + 0
= 2002
.
d. -329 - ( 15 - 101 ) - ( 25 - 440 )
= - 329 - 15 + 101 - 25 + 440
= - 329 + (- 15 - 25 ) + 101 + 440
= - 329 - ( 40 - 440 ) + 101
= - 329 + 101 + 400
= -228 + 400
= 172