(99-9)x2= - 180, 2+2 - =4, 4+4 - =8, 3+3 - =6, 5+5 - =10, 6+6 - =12, 7+7 - =14, 8+8 - =16, 9+9 - =18, 14+9 - =23,

TMC培B 王善怡P4四則運算(重做2-10,要4年級能力)

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