-3 i 1/2)²=(-7/2)²=(-7/2)·(-7/2)=49/4=12 i 1/4
a) -5·(-5)^9:(-5)^8=(-5)^10:(-5)^8=(-5)²=25
b) (-3)^7:(-3)^6·(-3)²=(-3)·(-3)²=(-3)³=-27
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-3 i 1/2)²=(-7/2)²=(-7/2)·(-7/2)=49/4=12 i 1/4
a) -5·(-5)^9:(-5)^8=(-5)^10:(-5)^8=(-5)²=25
b) (-3)^7:(-3)^6·(-3)²=(-3)·(-3)²=(-3)³=-27