五年级数学题！
0.8+0.88＝0.8+0.88+0.888＝0.8+0.88+0.888+0.8888＝0.8+0.88+0.888+0.8888+......+0.8888888＝...
0.8+0.88＝
0.8+0.88+0.888＝
0.8+0.88+0.888+0.8888＝
0.8+0.88+0.888+0.8888+... ...+0.8888888＝ 展开
0.8+0.88+0.888＝
0.8+0.88+0.888+0.8888＝
0.8+0.88+0.888+0.8888+... ...+0.8888888＝ 展开
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解：0.8+0.88＝0.8×﹙1＋1.1﹚＝0.8×2.1＝1.68
0.8+0.88+0.888＝＝0.8－﹙1＋1.1＋1.11﹚＝0.8×3.21＝2.568
0.8+0.88+0.888+0.8888＝0.8×﹙1＋1.1＋1.11＋1.111﹚＝0.8×4.321＝3.4568
0.8+0.88+0.888+0.8888+... ...+0.8888888＝0.8×﹙1＋1.1＋1.11＋1.111＋1.1111﹚＝0.8×5.4321＝4.34568
0.8+0.88+0.888＝＝0.8－﹙1＋1.1＋1.11﹚＝0.8×3.21＝2.568
0.8+0.88+0.888+0.8888＝0.8×﹙1＋1.1＋1.11＋1.111﹚＝0.8×4.321＝3.4568
0.8+0.88+0.888+0.8888+... ...+0.8888888＝0.8×﹙1＋1.1＋1.11＋1.111＋1.1111﹚＝0.8×5.4321＝4.34568
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