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

Toán Lớp 4: Bài 1. Tı́nh ba)ng cách thuận tiện: a.123,63 + 749,65 + 176,37 – 49,65 b.(47,86 – 6,7 ) – ( 7,86 + 3,3) c. 38,25 + 21,64 -18,25 + 9,93

Tháng Năm 31, 2022 Toán học 2 Comments 0 views

Toán Lớp 4: Bài 1. Tı́nh ba)ng cách thuận tiện:
a.123,63 + 749,65 + 176,37 – 49,65
b.(47,86 – 6,7 ) – ( 7,86 + 3,3)
c. 38,25 + 21,64 -18,25 + 9,93 – 11,64
d.(78,43 – 13,47 ) – ( 28,43 – 3,47)
e. (10.38 +12,58 + 14,68) – (0,38 + 4,68 + 2,58)

Comments ( 2 )

  1. truongthanhhung
    truongthanhhung
    31 Tháng Năm, 2022 at 2:39 sáng
    Reply
    a) 123,63+749,65+176,37-49,65
    =(123,63+176,37)+(749,65-49,65)
    =190+700
    =890
    b) (47,86-6,7)-(7,86+3,3)
    =47,86-6,7-7,86-3,3
    =(47,86-7,86)+(-6,7-3,3)
    =40+(-10)
    =30
    c) 38,25+21,64-18,25+9,93-11,64
    =(38,25-18,25)+(21,64-11,64)+9,93
    =20+10+9,93
    =39,93
    d) (78,43-13,47)-(28,43-3,47)
    =78,43-13,47-28,43+3,47
    =(78,43-28,43)+(-13,47+3,47)
    =50+(-10)
    =40
    e) (10,38+12,58+14,68)-(0,38+4,68+2,58)
    =10,38+12,58+14,68-0,38-4,68-2,58
    =(10,38-0,38)+(12,58-2,58)+(14,68-4,68)
    =10+10+10
    =30

  2. kimlien
    kimlien
    31 Tháng Năm, 2022 at 2:39 sáng
    Reply
    a) 123,63 + 749,65 + 176,37 – 49,65
      = ( 123,63 + 176,37 ) + ( 749,65 – 49,65 )
      = 300 + 700
      = 1000
    b) ( 47,86 – 6,7 ) – ( 7,86 + 3,3 )
      = ( 47,86 – 7,86 ) – ( 6,7 + 3,3 )
      = 40 – 10
      = 30
    c) 38,25 + 21,64 – 18,25 + 9,93 – 11,64
       = ( 38,25 – 18,25 ) + ( 21,64 – 11,64 ) + 9,93
       = 20 + 10 + 9,93
       = 39,93
    d) ( 78,43 – 13,47 ) – ( 28,43 – 3,47 )
       = ( 78,43 – 28,43 ) – ( 13,47 – 3,47 ) 
       = 50 – 10
       = 40
    e) ( 10,38 + 12,58 + 14,68 ) – ( 0,38 + 4,68 + 2,58 )
       = 10,38 + 12,58 + 14,68 – 0,38 – 4,68 – 2,58
       = ( 10,38 – 0,38 ) + ( 12,58 – 2,58 ) + ( 14,68 – 4,68 )
       = 10 + 10 + 10
       = 30
     

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

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