Giải các hệ phương trình sau ,sử dụng hàm MINVERSE(array1,array2,array3,...) và MMULT(array1,array2) trong excel để giải:
a)\begin{cases}2a+2b-3c-6d+e=11\\ a-2b-2c+10d-e=2\\6a-4e+5d=7b+13c-12\\7a+8b=9c+10d-11e+38\\a-2(b-c-d)+11=b-3(a+4e-2c+d)\end{cases}
b)\begin{cases}a+2b-4c+d-3e=0 \\ 13a-2b+c-5d=17e \\103a-110b=68c+64d-1221\\a-2b+c-2d+e=121\\12e+a-4b=-17c+17d-341\end{cases}
a) \begin{cases}a=14 \\ b=\frac{89}{22}\\c=\frac{69}{11}\\d=\frac{13}{22}\\e=-\frac{30}{11} \end{cases}
b) \begin{cases}a=-\frac{155012}{303} \\ b=-\frac{4184125}{16362}\\c=-\frac{829444}{8181}\\d=-\frac{233629}{909}\\e=-\frac{794926}{2727} \end{cases}

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