6.42×1.01-6.02=(6.02+0.4)x1.01-6.02=6.02x1.01+0.4x1.01-6.02=6.02x(1.01-1)+0.4x1.01=6.02x0.01+0.4x1.01=0.0602+0.404=0.4642
6.42×1.01-6.02=6.42×1+6.42×0.01-6.02=6.42-6.02+0.0642=0.40+0.0642=0.4642