己知：鴨的只數(shù)+豬的頭數(shù)=80,
鴨的腿數(shù)+豬的腿數(shù)=196,
設(shè)：鴨的只數(shù)為X,豬的頭數(shù)為Y.
則：X+Y=80,
2X+4Y=196.
一個(gè)飼養(yǎng)場中鴨的只數(shù)與豬的頭數(shù)之和是80,鴨和豬的腿數(shù)之和是196,若鴨的只數(shù)為X,則可列方程為_______?
一個(gè)飼養(yǎng)場中鴨的只數(shù)與豬的頭數(shù)之和是80,鴨和豬的腿數(shù)之和是196,若鴨的只數(shù)為X,則可列方程為_______?
數(shù)學(xué)人氣：261 ℃時(shí)間：2020-05-25 13:03:49
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