=125×8+125×4 =1000+500 =1500
=125×8×4 =1000×4 =4000
=64×(99+1) =64×100 =6400
=64×100-64 =6400-64 =6336
=85×(101-1) =85×100 =8500
=85×100+85 =8500+85 =8585
=510÷(2×5) =510÷10 =51
=270÷(45×2) =270÷90 =3
=45×(102-2) =45×100 =4500
=54×(176-76) =54×100 =5400
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