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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 3: a, 237 + 357 + 763 b, 2345 + 4257 – 345 c, 4276 + 2357 + 5724 + 7643 d, 3145 + 2496 + 5347 + 7504 + 4653 e, 2376 + 3425 – 376 – 425

Toán Lớp 3: a, 237 + 357 + 763
b, 2345 + 4257 – 345
c, 4276 + 2357 + 5724 + 7643
d, 3145 + 2496 + 5347 + 7504 + 4653
e, 2376 + 3425 – 376 – 425
g, 3145 – 246 + 2347 – 145 + 4246 – 347

Comments ( 2 )

  1. a) 237 + 357 + 763
    = ( 237 + 763) + 357
    = 1000 + 357
    =  1357
    b) 2345 + 4257 – 345
    = ( 2345 – 345) + 4257
    = 2000 + 4257
    = 6257
    c) 4276 + 2357 + 5724 + 7643
    = ( 4276 + 5724) + ( 2357 +7643)
    = 10 000 +  10 000
    = 20 000
    d)  3145 + 2496 + 5347 + 7504 + 4653
    = 3145 + ( 2496 + 7504) + ( 5347 + 4653)
    = 3145 + 10 000 + 10 000
    = 3145 + 20 000
    = 23145
    e) 2376 + 3425 – 376 – 425
    = ( 2376 – 376) + ( 3425 – 425)
    = 2000 + 3000
    = 5 000
    g) 3145 – 246 + 2347 – 145 + 4246 – 347
    =( 3145 – 145) + ( 2347 – 347) + ( 4246 – 246)
    = 3000 + 2000 + 4000
    = 9 000

  2. a. text{ 237 + 357 + 763 }
    = text{ (237 + 763) + 357 }
    = 1000 + 357
    = 1357  
    b. text{ 2345 + 4257 – 345 }
    text{ = (2345 – 345) + 4257 }
    text{ = 2000 + 4257 }
    text{ = 6257 }  
    c. text{ 4276 + 2357 + 5724 + 7643 }
    text{ = (4276 + 5724) + (2357 + 7643) }
    text{ = 10000 + 10000 }
    text{ = 20000 }
    d. text{ 3145 + 2496 + 5347 + 7504 + 4653 }
    text{ = (2496 + 7504) + (5347 + 4653) + 3145 }
    text{ = 10000 + 10000 + 3145 }
    text{ = 23145 }
    e. text{ 2376 + 3425 – 376 – 425 }
    text{ = (2376 – 376) + (3425 – 425) }
    text{ = 2000 + 3000 }
    text{ = 5000 }
    g. text{ 3145 – 246 + 2347 – 145 + 4246 – 347 }
    text{ = (3145 – 145) + (4246 – 246) + (2347 – 347) }
    text{ = 3000 + 4000 + 2000 }
    text{ = 9000 } 
    #Học tốt.

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222-9+11+12:2*14+14 = ? ( )