16.用代入法解方程组$\left\{\begin{array}{l}{x-2y=5①}\\{5x+y=3②}\end{array}\right.$,以下各式正确的是( )
| A. | x-2(3-5x)=2 | B. | x-5=2(3-5x) | C. | 5x+(x-5)=3 | D. | 5x(x-5)=6 |
14.方程组$\left\{\begin{array}{l}{3(x-1)=4(y-4)}\\{5(y-1)=3(x+5)}\end{array}\right.$中的x与y的积为2m-7,试求m的值.
0 279945 279953 279959 279963 279969 279971 279975 279981 279983 279989 279995 279999 280001 280005 280011 280013 280019 280023 280025 280029 280031 280035 280037 280039 280040 280041 280043 280044 280045 280047 280049 280053 280055 280059 280061 280065 280071 280073 280079 280083 280085 280089 280095 280101 280103 280109 280113 280115 280121 280125 280131 280139 366461