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

Toán Lớp 5: 21,37 x 27,5 + 72,4 x 21,37 + 2,137 tính bằng cách thuận tiện

Toán Lớp 5: 21,37 x 27,5 + 72,4 x 21,37 + 2,137 tính bằng cách thuận tiện

Comments ( 2 )

  1. 21,37*27,5+72,4*21,37+2,137
    =21,37*(27,5+72,4+0,1)
    =21,37*100
    =2137

  2. 21,37 x 27,5 + 72,4 x 21,37 + 2,137
    = 21,37 x 27,5 + 72,4 x 21,37 + 21,37 x 0,1
    = 21,37 x (27,5 + 72,4 + 0,1)
    = 21,37 x 100
    = 2137

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