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

Toán Lớp 3: Tính nhanh: 16) 2 x 5 + 5 x 7 + 9 x 3 17) 15 : 5 + 27 : 5 + 8 : 5

Toán Lớp 3: Tính nhanh:
16) 2 x 5 + 5 x 7 + 9 x 3
17) 15 : 5 + 27 : 5 + 8 : 5

Comments ( 2 )

  1. 16) 2 x 5 + 5 x 7 + 9 x 3 = 5 x (2 + 7) + 9 x 3 = 5 x 9 + 9 x 3 = (5 + 3) x 9 = 72
    17) 15 : 5 + 27 : 5 + 8 : 5 = (15 + 27 + 8) : 5 = 50 : 5 = 10
     

  2. 2 xx 5 + 5 xx 7 + 9 xx 3
    = 5 xx (2 + 7) + 9 xx 3
    = 5 xx 9 + 9 xx 3
    = 9 xx (5 + 3)
    = 9 xx 8
    = 72.
    15 : 5 + 27 : 5 + 8 : 5
    = (15 + 27 + 8) : 5
    = 50 : 5
    = 10.
    ~ Xin câu trả lời hay nhất cho nhóm!!! ~

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

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