18.9x178.178+0.49-17.8x189.189

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18.9x178.178+0.49-17.8x189.189
=189x17.8189-17.8x189.189+0.49
=(189x17.8+189x0.0189)-17.8x189.189+0.49
=17.8x(189-189.189)+17.8x0.0189+0.49
=17.8x0.0189-17.8x0.0189+0.49
=0.49

18.9x178.178+0.49-17.8x189.189 18.9X178.178+0.49-17.8X189.189=? 18.9x178.178+0.49－17.8x189.189如何简算? 两道简便算法1.199.199X198-198.198X1992.18.9X178.178+0.49-17.8X189. 用简便算法计算:199.199X198-198.198X199 18.9x178.178+0.49-17.8X189.1 用简便方法做 199.199x198-198.198x199 18.9x178.178+0.49-17.8x189.18 18.9x178,178+0,49-17.8x189.189用简便方法 18.9×178.178+0.49-17.8×189.189 18.9*178.178+0.49-17.8*189.189 18.9*178.178+0.49-17.8*189.18 18.9*178.178+0.49-17.8*189.189简便运算, 简便计算：18.9*178.178+0.49-17.8*189.189