thuc hien phep tinh [don vi cm] 3m40cm+4m24cm-5m69cm 72m6cm-56m50 cm+7m44cm 8m27dm+3m35cm+3dm65cm 98m20cm*2+23m30cm*2 18m40cm*4+80m5dm*8 mong moi nguoi giup do minh

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