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

Toán Lớp 6: Tính hợp lí nếu có thể a. −317 + 402 − 583 + 98 b. 18.7 65:( 13)

Toán Lớp 6: Tính hợp lí nếu có thể
a. −317 + 402 − 583 + 98
b. 18.7 65:( 13)

Comments ( 2 )

  1. a) -317 + 402 – 583 + 98
    = – 317 – 583 + 402 + 98
    = – ( 317 + 583 ) + ( 402 + 98 )
    = – 900 + 500
    = 500 – 900
    = 400
    b) 18 . 7 xx 65 : 13
    = 126 xx 5
    = 630  
     

  2. a. −317 + 402 − 583 + 98
    = -317-583+402+98
    = -900+500
    = -400
    b. 18.7 65:( 13)
    = 126 . 5
    = 630

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