简便计算:18.9x178.178＋0.49 -17.8x189.189
答案:1 悬赏:20 手机版
解决时间 2021-02-24 14:48
- 提问者网友：伴风望海
- 2021-02-24 10:04
简便计算:18.9x178.178＋0.49 -17.8x189.189
最佳答案
- 五星知识达人网友：摆渡翁
- 2021-02-24 10:28
18.9x178.178+0.49 -17.8x189.189
=18.9x178×1.001-17.8x189×1.001+0.49
=18.9x178×1.001-18.9×178×1.001+0.49
=0+0.49
=0.49追答说明：
178.178
=178+0.178
=178×1+178×0.001
=178×(1+0.001)
=178×1.001
189.189
=189+0.189
=189×1+189×0.001
=189×(1+0.001)
=189×1.001
=18.9x178×1.001-17.8x189×1.001+0.49
=18.9x178×1.001-18.9×178×1.001+0.49
=0+0.49
=0.49追答说明：
178.178
=178+0.178
=178×1+178×0.001
=178×(1+0.001)
=178×1.001
189.189
=189+0.189
=189×1+189×0.001
=189×(1+0.001)
=189×1.001
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