Một chú chó con cân nặng 2,3 kg. Một chú mèo con nhẹ hơn chú chó con 1,8 kg. Hỏi cả chó con và mèo con cân nặng bao nhiêu ki-lô-gam?

6,48 – (4,48 + 0,9) = .........................

                               = .........................

6,48 – 4,48 – 0,9 = .........................

                            = .........................

Vậy:

6,48 – (4,48 + 0,9) ..... 6,48 – 4,48 – 0,9

9 – 4,37 – 0,63 = .........................

                         = .........................

9 – (4,37 + 0,63) = .........................

                           = ..........................

Vậy:

9 – 4,37 – 0,63 ...... 9 – (4,37 + 0,63)

8,44 – (5,44 + 2,8) = ......................

                              = ......................

                              = ......................

5,27 – 3,9 – 0,1 = ......................

                          = ......................

                          = ......................

42,5 + 6,2

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12,97 + 0,39

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16,58 – 4

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54,1 – 35

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................................

................................

63,79 + 24

................................

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29 – 6,86

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................................

26,38 – (7,5 + 3,16) = ..................

                                = ..................

3,72 + 4,85 + 2,28 = ...................

                              = ...................

                              = ...................

50,04 – 15,7 – 10,34 = .................

                                    = .................

4,51 + 2,08 + 1,49 + 2,92 = .............

                                          = ............

                                          = ............