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

Toán Lớp 5: Tính = cách thuận tiện a) 60-26,75 -13,25 B) 38,25 -18,25+21,64-11,64+9,93 C) 45,28+52,17-15,28-12,17 d) (72,69+18,47) – (8,47+22,69)

Tháng Hai 7, 2023 Toán học 2 Comments 0 views

Toán Lớp 5: Tính = cách thuận tiện
a) 60-26,75 -13,25
B) 38,25 -18,25+21,64-11,64+9,93
C) 45,28+52,17-15,28-12,17
d) (72,69+18,47) – (8,47+22,69)
e) 64 × 23 + 37×23-23

Comments ( 2 )

  1. lanngocha
    lanngocha
    7 Tháng Hai, 2023 at 5:38 chiều
    Reply
    a) 60 – 26,75 – 13,25
    = 60 – ( 26,75 + 13,25)
    = 60 – 40
    = 20
    ——————————–
    b) 38,25 – 18,25+ 21,64- 11,64+ 9,93
    = ( 38,25 – 18,25) -+( 21,64 – 11,64) + 9,93
    = 20 +10 + 9,93
    = 30 + 9,93
    = 39,93
    ——————————–
    c)45,28+52,17-15,28-12,17
    = ( 45,28 – 15,28) + ( 52,17 – 12,17)
    = 30 + 40
    = 70
    ————————————–
    d) (72,69+18,47) – (8,47+22,69)
    = 72,69 + 18,47 – 8,47 – 22,69
    = ( 72,69 – 22,69) + ( 18,47 – 8,47)
    = 50 + 10
    = 60
    ——————————————
    e) 64 xx 23 + 37xx23-23
    = 64 xx 23 + 37 xx 23 – 23 xx 1
    = 23 xx ( 64 + 37 – 1)
    = 23 xx100
    = 2300

  2. daithanh
    daithanh
    7 Tháng Hai, 2023 at 5:38 chiều
    Reply
    a,
    60 – 26,75 – 13,25
    = 60 – (26,75 + 13,25)
    = 60 – 40
    = 20
    b,
    38,25 – 18,25 + 21,64 – 11,64 + 9,93
    = (38,25 – 18,25) + (21,64 – 11,64) + 9,93
    = 20 + 10 + 9,93
    = 39,93
    c,
    45,28 + 52,17 – 15,28 – 12,17
    = (45,28 – 15,28) + (52,17 – 12,17)
    = 30 + 40
    = 70
    d,
    (72,69 + 18,47) – (8,47 + 22,69)
    = 72,69 + 18,47 – 8,47 – 22,69
    = (72,69 – 22,69) + (18,47 – 8,47)
    = 50 + 10
    = 60
    e,
    64 × 23 + 37 × 23 – 23
    = (64 + 37 – 1) × 23
    = 100 × 23
    = 2300

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

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