Пожалуйста помогите номер 151 и 152

151
1) $6 sqrt{2} +5 sqrt{18}=6 sqrt{2}+5 sqrt{2*9}=6 sqrt{2}+15 sqrt{2}=21 sqrt{2}$
2) $5 sqrt{75} -2 sqrt{27} =5 sqrt{3*25}-2 sqrt{3*9} =25 sqrt{3}-6 sqrt{3}= 19 sqrt{3}$
3) $sqrt{2}+ sqrt{50}- sqrt{18} = sqrt{2}+ sqrt{25*2}- sqrt{2*9}= sqrt{2}+5 sqrt{2}-3 sqrt{2}=3 sqrt{2}$
4) $3 sqrt{20} +5 sqrt{45} -2 sqrt{80}= 3 sqrt{5*4}+5 sqrt{9*5}-2 sqrt{5*16}=$ $6 sqrt{5}+15 sqrt{5}-8 sqrt{5}= 13 sqrt{5}$
5) $2 sqrt{48} + sqrt{27} + sqrt{12} =2 sqrt{16*3}+ sqrt{9*3}+ sqrt{3*4}=8 sqrt{3}+3 sqrt{3}+2 sqrt{3}$ = $13 sqrt{3}$
6) $( sqrt{3} -1)( sqrt{3}+1)= sqrt{9}-1=3-1=2$
152.
1) $2 sqrt{5} textless sqrt{45} ( sqrt{9*5}=3 sqrt{5} )$
2) $sqrt{27}( sqrt{3*9}=3 sqrt{3} ) textless 4 sqrt{3}$
3) $5 sqrt{7} textgreater sqrt{63}( sqrt{7*9}=3 sqrt{7})$
4) $7 sqrt{2} textgreater sqrt{72}( sqrt{2*16}=4 sqrt{2})$