18.9*178.178+0.49-17.8*189.189,我知道答案为0.49,但要知道是怎么算的?Thanks a lot.

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18.9*178.178+0.49-17.8*189.189,我知道答案为0.49,但要知道是怎么算的?Thanksalot.18.9*178.178+0.49-17.8*189.189,我知道答案为

18.9*178.178+0.49-17.8*189.189,我知道答案为0.49,但要知道是怎么算的?Thanks a lot.
18.9*178.178+0.49-17.8*189.189,我知道答案为0.49,但要知道是怎么算的?
Thanks a lot.

18.9*178.178+0.49-17.8*189.189,我知道答案为0.49,但要知道是怎么算的?Thanks a lot.
18.9*178.178+0.49-17.8*189.189
=18.9*17.8*10.1+0.49-17.8*18.9*10.1
=0.49
18.9*178.178+0.49-17.8*189.189
=18.9*178.178-17.8*189.189+0.49
=18.9*17.8(10.01-10.01)+0.49
=0.49

18.9*178.178+0.49-17.8*189.189
=18.9*17.8*10.1+0.49-17.8*18.9*10.1
=0.49

18.9*178.178+0.49-17.8*189.189
=18.9*178.178-17.8*189.189+0.49
=18.9*17.8(10.01-10.01)+0.49
=0.49

等于0.49

18.9×178.178+0.49-17.8×189.189
=18.9×178.178-17.8×189.189+0.49
=18.9×17.8(10.01-10.01)+0.49
=0.49

18.9*178.178+0.49-17.8*189.189
=189*0.1*178*1.001+0.49+178*0.1*189*1.001
=0.49