Объяснение:
1) (1 1/7)²=(8/7)²=64/49
2)(-1)²⁰-(-1)²¹=1-(-1)=1+1=2
3)81×27/3⁵=81×27/3×3×3×3×3=81×27/27×9=9
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Объяснение:
1) (1 1/7)²=(8/7)²=64/49
2)(-1)²⁰-(-1)²¹=1-(-1)=1+1=2
3)81×27/3⁵=81×27/3×3×3×3×3=81×27/27×9=9