ch exponent and power class 8
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(-4/9)^3÷(-4/9)^6
=(-4/9)^3×(9/-4)^6
=-4/9 × -4/9 × -4/9 × 9/-4 × 9/-4 × 9/-4 × 9/-4 × 9/-4 × 9/-4
=(9/-4)^3
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