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

Toán Lớp 5: tính nhanh 123 – 128 + 133 – 138 + 143 – 148 + 153 – 158 + 163

Toán Lớp 5: tính nhanh 123 – 128 + 133 – 138 + 143 – 148 + 153 – 158 + 163

Comments ( 2 )

  1. 123 – 128 + 133 – 138 + 143 – 148 + 153 – 158 + 163
    = 123 + (133 – 128) + (143 – 138) + (153 – 148) + (163 – 158)
    = 123 + 5 + 5 + 5 + 5
    = 123 + 5 xx 4
    = 123 + 20
    = 143

  2. 123 – 128 + 133 – 138 + 143 – 148 + 153 – 158 + 163
    =(123+133+143+153+163)-(128+138+148+158)
    =715-572
    =143
     

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