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ex.1   Calculati dupa modelul dat:
1 176-9=(1 176-10)+1              1 176-90=(1 176-100)+10
            =1 166+1                                    =1 076+10
            =1 167                                        =1 086

a).2 248-9=                  b).3 637-9=               c).6 600-9=
    2 248-90=                    3 637-90=                  6 600-90=