Question

已知A=9.876543X3.456789,B=9.876544X3.456788,A和B那个大些?（提示：用乘法分配律

Answer 1

B =(9.876543+0.000001)X(3.456789-0.000001)

=9.876543X(3.456789-0.000001)+0.000001X(3.456789-0.000001)

=9.876543X3.456789-9.876543*0.000001+0.000001X(3.456789-0.000001)

=A +0.000001*(3.456789-0.000001-9.876543)

因为3.456789-0.000001-9.876543