Пожалуйста, помогите!!!!
1){2^х-9×3^у=7
{2^х×3^у=8/9
2) {3^х×2^у=4
{3^у×2^х=9
1){2^х-9×3^у=7
{2^х×3^у=8/9
2) {3^х×2^у=4
{3^у×2^х=9
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