Giai                                                                                 Sô khu vuon cây thành 2 lô đât là                                                                                                                 101+ 2=103(cây con)                                                                                   khu vuon đó trông đuọc sô cây con là                                                                                                        103×4=112(cây con

AB,AD,:là góc không vuông:BC, DC:là góc không vuông.

79+34-19=94        563-99=464       221×(43-39)=884        936÷3=312

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