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

Toán Lớp 5: làm ơn giúp em với ạ câu 1:tính nhanh a)625 + 327 + 148 + 15 + 73 b)146 + 121 + 54 + 379 c) 35 x 34 + 35 x 86 + 65 x 75 + 65

Toán Lớp 5: làm ơn giúp em với ạ
câu 1:tính nhanh
a)625 + 327 + 148 + 15 + 73
b)146 + 121 + 54 + 379
c) 35 x 34 + 35 x 86 + 65 x 75 + 65 x 45
d) 3 x 25 x 8 + 4 x 37 x 6 +2 x 38 x12
e) 12 x 53 + 53 x 172 – 53 x 84

Comments ( 2 )

  1. a)625+327+148+15+73
    =(625+15)+(327+73)+148
    =640+400+148
    =1188
    b)146+121+54+379
    =(146+54)+(121+379)
    =200+500
    =700
    c)35×34+35×86+65×75+65×45
    =35×(34+86)+65×(75+45)
    =35×120+65×120
    =120×(35+65)
    =120×100
    =12000
    d)3×25×8+4×37×6+2×38×12
    =(3×8)×25+(4×6)×37+(2×12)×38
    =24×25+24×37+24×38
    =24×(25+37+38)
    =24×100
    =2400
    e)12×53+53×172-53×84
    =53×(12+172-84)
    =53×100
    =5300
     

  2. # tcv
    a )
    625 + 327 + 148 + 15 + 73
    = ( 625 + 15 ) + ( 327 + 73 ) + 148
    = 640 + 400 + 148
    = 1040 + 148 = 1188
    b )
    146 + 121 + 54 + 379
    = ( 146 + 54 ) + ( 121 + 379 )
    = 200 + 500 = 700
    c )
    35 xx 34 + 35 xx 86 + 65 xx 75 + 65 xx 45
    = 35 xx ( 34 + 86 ) + 65 xx ( 75 + 45 )
    = 35 xx 120 + 65 xx 120
    = 120 xx ( 35 + 65 )
    = 120 xx 100 = 12000
    d )
    3 xx 25 xx 8 + 4 xx 37 xx 6 + 2 xx 38 xx 12
    = 25 xx ( 3 xx 8 ) + 37 xx ( 4 xx 6 ) + 38 xx ( 2 xx 12 )
    = 25 xx 24 + 37 xx 24 + 38 xx 24
    = 24 xx ( 25 + 37 + 38 )
    = 24 xx 100 = 2400
    e )
    12 xx 53 + 53 xx 172 – 53 xx 84
    = 53 xx ( 12 + 172 – 84 )
    = 53 xx 100 = 5300

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