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

Toán Lớp 6: 1.46.Tính: a)235+78-142; b)14+2.82; c){23+[1+(3-1)2]}÷13.

Toán Lớp 6: 1.46.Tính:
a)235+78-142;
b)14+2.82;
c){23+[1+(3-1)2]}÷13.

Comments ( 2 )

  1. a)235+78-142
    =142+93+78-142
    =93+78+(142+142)
    =171+0
    =171
    b)14+2.82
    =2.7+2.82
    =2.(7+82)
    =2.89
    =178
    c){23+[1+(3-1).2]}:13
    =[23+(1.2+2.2)]:13
    =(23+6):13
    =(29)/13.
     

  2. Giải đáp:
    a, 235+78-142
    = (235 – 142) + 78
    = 93 + 78
    = 171
    b, 14+2.82
    = 7.2 + 2.82
    = 2.(7+82)
    = 2.89
    = 178
    c, {23+[1+(3-1).2]}÷13
    = {23+[1+2.2]}÷13
    = {23+[1+4]}÷13
    = {23+5}÷13
    = 28 ÷ 13
    = 28/13
    Go od luck!
     

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