49ⅹ48+49ⅹ54-94x2=49×(48+54)-94×2=49×102-94×2=49×100+49×2-94×2=4900-2×(94-49)=4900-2×45=4900-90=4810
49×48+49×54-49×2=49×(48+54-2)=49×100=4900
49ⅹ48+49ⅹ54-49x2=49x(48+54-2)=49x100=4900