Помогите пожалуйста. Срочно !!!!

2
$4a^7b^4/5c6d^3 *15bc^3/8a^6d^2*2cd/3ad=b^5/cd^5$
3
$(a ^{1/3} -b ^{1/3} )(a ^{2/3} +(ab) ^{1/3} +b ^{2/3} )/(a 1/3^{2} -b ^{1/3} )-$ $(a ^{1/3} +b ^{1/3} )(a ^{2/3}-(ab) ^{1/3} +b ^{2/3} }) /(a ^{1/3}+b ^{1/3} )=$ $a ^{2/3} +(ab) ^{1/3} +b ^{2/3} -a ^{2/3} +(ab) ^{1/3}-b ^{2/3} =2(ab) ^{1/3}$
6
1) $[(2^3) ^{-2/3} *(5^2) ^{-1/2} -1/2)]/[(2^6) ^{1/4} *2 ^{1/2} ]=$ $(2 ^{-2} *5 ^{-1} -0,5)/(2 ^{3/2} *2 ^{1/2} )=(1/20-0,5)/2^2=(0,05-0,5)/4=$ $-4,5/4=-1,125$
2) $4a^5x^3y/5b^3cz^4 *3bc^2z^4/8a^6x^3y^4=3c/10y^3b^2$
3) $(a ^{1/2-b ^{1/2} })(a ^{1/2} +b ^{1/2} )/[a ^{1/2} ( ^{1/4} +b ^{1/4} )]-(a ^{1/4} -b ^{1/4} (a ^{1/4} +b ^{1/4} )/$ $(a ^{1/4} +b ^{1/4} )=(a ^{1/4} +b ^{1/4})(a ^{1/4} -b ^{1/4} )(a ^{1/2} +b ^{1/2})/[a ^{1/2} (a ^{1/4} +b ^{1/4} )$ $(a ^{1/4} -b ^{1/4} )=(a ^{1/4} -b ^{1/4} )(a ^{1/2}+b ^{1/2} )/a ^{1/2} -(a ^{1/4} -b ^{1/4} )=(a ^{1/4}$ $-b ^{1/4} )(a ^{1/2} +b ^{1/2} -a ^{1/2} )/a ^{1/2} =b ^{1/2} (a ^{1/4} -b ^{1/4})/a ^{1/2}$