(40. Să se efectueze calculele: a) 2√2-√√5-3√5-√2+4√5.3√2-5√5.4√2; b) √3-3√2-5√6.4+4√3.2√2-4√2.3√3; c) √21:√7-5√15:√5 +2.3√3-4√30:√10; d) 2√35:√5-4√21:2√3-5-2√7+6√42:√6; e) √3(2√2-√5)-√2(3√3+2√5)+ √5(2√2+√3); (√2+2√3)√3-2√2(3√3+5√2)+√3(4√2+√3); g) 2√6 (3√2-2√3)-2√3(4√2-√6)-3√2(4√6 +√3).
