计算:(b²/a)^-2=________ 计算:1÷(1/R1+1/R2)=____
问题描述:
计算:(b²/a)^-2=________ 计算:1÷(1/R1+1/R2)=____
答
解1:
(b²/a)^(-2)=1/(b²/a)²
=1/[(b^4)/a²]
=a²/(b^4)
解2:
1÷[1/(R1)+1/(R2)]=1÷{[(R1)+(R2)]/[(R1)(R2)]}
=1×{(R1)(R2)/[(R1)+(R2)]}
=(R1)(R2)/[(R1)+(R2)]
答
第一个空 a^2/b^4
答
计算:(b²/a)^-2=a²/b^4;
计算:1÷(1/R1+1/R2)
=1÷((R1+R2)/(R1R2))
=(R1R2)/(R1+R2);
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