Toán Lớp 7: 6.8^x-1+8^x+1=6.8^19+8^21
5.2^x+3.2^x+2=5.2^5+3.2^7
4.3^x-1+2.3^x+2=4.3^6+2.3^9
11.6^x-1+2.6^x+1=11.6^11+2.6^13
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Toán Lớp 7: 6.8^x-1+8^x+1=6.8^19+8^21
5.2^x+3.2^x+2=5.2^5+3.2^7
4.3^x-1+2.3^x+2=4.3^6+2.3^9
11.6^x-1+2.6^x+1=11.6^11+2.6^13
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