搜搜做题作业网about quadratic equation
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about quadratic equation
Joan is 2 years younger than her brother Matthew,and 32 years younger than her father.Three years ago,the product of the ages of Joan and Matthew was exactly 2 times the age of their father.How old is Matthew now?PS:Ans is 13
Joan is 2 years younger than her brother Matthew,and 32 years younger than her father.Three years ago,the product of the ages of Joan and Matthew was exactly 2 times the age of their father.How old is Matthew now?PS:Ans is 13
J=JOAH M=MATTHEW F=FATHER
M=J+2 F=J+32
the product of 乘积的意思 因为是三年前
即 (J-3)(M-3)=2(F-3)
带入前俩式子 得(J-3)(J+2-3)=2(J+32-3)
解二元一次会吗 然后就出来了 J=11或-5(舍 因为年龄>0)
M=11+2=13
M=J+2 F=J+32
the product of 乘积的意思 因为是三年前
即 (J-3)(M-3)=2(F-3)
带入前俩式子 得(J-3)(J+2-3)=2(J+32-3)
解二元一次会吗 然后就出来了 J=11或-5(舍 因为年龄>0)
M=11+2=13
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