Question

18£®ÒÑÖª·½³Ì×é$\left\{\begin{array}{l}{2x-5y=-21}\\{4x+3y=23}\end{array}\right.$µÄ½âΪ$\left\{\begin{array}{l}{x=2}\\{y=5}\end{array}\right.$£¬Ôò·½³Ì×é$\left\{\begin{array}{l}{2£¨x-1£©-5£¨y+3£©=-21}\\{4£¨x-1£©+3£¨y+3£©=23}\end{array}\right.$µÄ½âΪ£¨¡¡¡¡£©

• A£® $\left\{\begin{array}{l}{x=2}\\{y=5}\end{array}\right.$
• B£® $\left\{\begin{array}{l}{x=1}\\{y=8}\end{array}\right.$
• C£® $\left\{\begin{array}{l}{x=-3}\\{y=-2}\end{array}\right.$
• D£® $\left\{\begin{array}{l}{x=3}\\{y=2}\end{array}\right.$

Answer 1

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½â´ð ½â£º¡ß·½³Ì×é$\left\{\begin{array}{l}{2x-5y=-21}\\{4x+3y=23}\end{array}\right.$µÄ½âΪ$\left\{\begin{array}{l}{x=2}\\{y=5}\end{array}\right.$£¬
¡à·½³Ì×é$\left\{\begin{array}{l}{2£¨x-1£©-5£¨y+3£©=-21}\\{4£¨x-1£©+3£¨y+3£©=23}\end{array}\right.$µÄ½âΪ$\left\{\begin{array}{l}{x-1=2}\\{y+3=5}\end{array}\right.$£¬
½âµÃ£º$\left\{\begin{array}{l}{x=3}\\{y=2}\end{array}\right.$£¬
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