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

Toán Lớp 6: tính hợp lí 43.78-43.48+30.80-30.23

Toán Lớp 6: tính hợp lí
43.78-43.48+30.80-30.23

Comments ( 2 )

  1. $@Zeng$
    $43.78-43.48+30.80-30.23$
    $=43(78-48)+30(80-23)$
    $=43.30+30.57$
    $=30(43+57)$
    $=30.100$
    $=3000$

  2. 43 . 78 – 43 . 48 + 30 . 80 – 30 . 23
    = 43 . ( 78 – 48 ) + 30 . ( 80 – 23 )
    = 43 . 30 + 30 . 57
    = 30 . ( 43 + 57 )
    = 30 . 100
    = 3000.
     

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