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

Toán Lớp 3: tính nhanh: a,1+2+3+4+5+6+7+7+8+9 b,3+6+4+8+2+7

Toán Lớp 3: tính nhanh:
a,1+2+3+4+5+6+7+7+8+9
b,3+6+4+8+2+7

Comments ( 2 )

  1. a,1+2+3+4+5+6+7+8+9
     =(1+9)+(2+8)+(3+7)+(4+6)+5
    =10+10+10+10+5
    =45
    b,3+6+4+8+2+7
    =(6+4)+(8+2)+(7+3)
    =10+10+10
    =30

  2. a, 1+2+3+4+5+6+7+8+9=(1+9)+(2+8)+(7+3)+(6+4)+5=10+10+10+10+5=10.4+5=45
    b, 3+6+4+8+2+7=(2+8)+(3+7)+(6+4)=10+10+10=10.3=30

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