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2.5x56+4.5x65的简便算

5Ⅹ56十4.5x65 =280+292.5 =572.5

把65提到前面变成65(56-56)=0

56x65-65x56 =56×(65-65) =0

985x56 =(1000-15)x65 =1000x65-15x65 =65000-15x(70-5) =65000-15x70+15x5 =65000-1050+75 =65075-1050 =64025 谢谢,请采纳

56×36-56+56×65 =56×(36-1+65) =56×(35+65) =56×100 =5600

3640

=55×36+45×36 =(55+45)×36 =100×36 =3600

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