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题型:解决问题 题类:常考题 难易度:普通
9的乘法口诀1864 9
27,42,45,82,72,54;65,36,81,19;56,90,63,99,74
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8×4= 9×7= 2×8= 7×8-8=
8×9= 4×6= 9×8= 2×9+9=
8×2= 4×9= 8×7= 1×8–8=
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