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1、20以内的不退位减法,1817,1918,176,141,163,1915,1211,191,1712,1712,172,194,193,1712,151,1613,1513,1815,153,175,1911,183,194,165,198,1813,173,1615,1811,1914,1816,1613,1611,1413,1815,1918,1914,1917,1511,1913,143,174,182,181,1413,1816,183,162,185,171,132,175,1917,1913,1311,1514,1716,143,196,1514,1612,1715,193,15
2、2,1916,192,187,141,1914,154,1613,197,152,171,164,174,164,121,172,131,1612,1816,1812,181,161,197,182,163,1311,1611,195,195,1817,1614,1614,161,121,198,1812,196,1711,1715,1811,1918,1815,1912,1711,1916,184,1913,1411,1611,162,1211,153,131,1814,175,184,1511,1817,195,185,1812,173,1514,1912,1311,1811,1512,1
3、63,151,142,1912,165,1715,181,1713,161,1911,187,1513,198,187,1814,1412,194,1713,164,1716,186,1711,1714,131,1513,1915,142,1312,143,1614,192,1714,1915,173,182,1411,1312,176,172,1813,154,1813,176,1511,1714,197,121,186,1211,132,1411,165,196,185,186,1412,1916,1615,1911,1512,1713,174,191,184,191,1512,152,132,1716,183,
