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Salut!
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✏ [tex] {0.5}^{7} \times {0.5}^{9} \div ( {0.5}^{4}) {}^{4} = {0.5}^{7 + 9} \div {0.5}^{4 \times 4} = {0.5}^{16} \div {0.5}^{16} = {0.5}^{16 - 16} = {0.5}^{0} = 1[/tex] ✔
✏ [tex] {0.5}^{7} \times {0.5}^{9} \div ( {0.5}^{4}) {}^{4} = {0.5}^{7 + 9} \div {0.5}^{4 \times 4} = {0.5}^{16} \div {0.5}^{16} = {0.5}^{16 - 16} = {0.5}^{0} = 1[/tex] ✔