简便计算下题1.9+99+999+……+99999999=?2.0.6*1.6+0.6*26.4+0.6*2=?3.1998+199.8+19.98+1.998+0.1998=?4.1-2+3-4+.+99-100+101=?5.1*1-2*2+3*3-4-4+.99*99-100*100+101*101=?最好用计算机算算自己做的对不对,再答复
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![简便计算下题1.9+99+999+……+99999999=?2.0.6*1.6+0.6*26.4+0.6*2=?3.1998+199.8+19.98+1.998+0.1998=?4.1-2+3-4+.+99-100+101=?5.1*1-2*2+3*3-4-4+.99*99-100*100+101*101=?最好用计算机算算自己做的对不对,再答复](/uploads/image/z/7787090-2-0.jpg?t=%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%E4%B8%8B%E9%A2%981.9%2B99%2B999%2B%E2%80%A6%E2%80%A6%2B99999999%3D%3F2.0.6%2A1.6%2B0.6%2A26.4%2B0.6%2A2%3D%3F3.1998%2B199.8%2B19.98%2B1.998%2B0.1998%3D%3F4.1-2%2B3-4%2B.%2B99-100%2B101%3D%3F5.1%2A1-2%2A2%2B3%2A3-4-4%2B.99%2A99-100%2A100%2B101%2A101%3D%3F%E6%9C%80%E5%A5%BD%E7%94%A8%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%AE%97%E7%AE%97%E8%87%AA%E5%B7%B1%E5%81%9A%E7%9A%84%E5%AF%B9%E4%B8%8D%E5%AF%B9%2C%E5%86%8D%E7%AD%94%E5%A4%8D)
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