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1/3除以(4%5/13%8/13)简便 (0.75%3/16)x(2/9+1/3...

简便计算 1/3÷(4-5/13-8/13) =1/3÷【4-(5/13+8/13)】 =1/3÷【4-1】 =1/3÷3 =1/9 (0.75-3/16)x(2/9+1/3) =9/16×5/9 =5/16

你好: (0.75-3/16)*(2/9+1/3) =(12/16-3/16)×(2/9+3/9) =9/16×5/9 =5/16 45*(7/9+4/15-3/5) =45x7/9+45x4/15-45x3/5 =35+12-27 =47-27 =20

如图,求出四个直角△的面积

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