bonsoir
( - 4 )² x ( - 7 ) ⁻² = ( - 4 )² x ( - 1/7 ) ² = ( 4/7 )²
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bonsoir
( - 4 )² x ( - 7 ) ⁻² = ( - 4 )² x ( - 1/7 ) ² = ( 4/7 )²