18.9x178.178+0.49-17.8x189.189如何简算?
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![18.9x178.178+0.49-17.8x189.189如何简算?](/uploads/image/z/108612-36-2.jpg?t=18.9x178.178%2B0.49%EF%BC%8D17.8x189.189%E5%A6%82%E4%BD%95%E7%AE%80%E7%AE%97%3F)
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18.9x178.178+0.49-17.8x189.189如何简算?
18.9x178.178+0.49-17.8x189.189如何简算?
18.9x178.178+0.49-17.8x189.189如何简算?
18.9x178.178+0.49-17.8x189.189
=18.9*178*1.001+0.49-17.8*189*1.001
=18.9*17.8*10*1.001+0.49-17.8*18.9*10*1.001
=0.49
18.9x178.178+0.49-17.8x189.189
=189*178(0.1*1.001-0.1*1.001)+0.49
=0+0.49
=0.49