①1997×19961996﹣1996×19971997
②
③3.672÷0.08÷ +3 ×3.95÷0.1-33 ÷2
④(1+ + + )×( + + + )-(1+ + + + )×( + + )
⑤ +( + )+( + + )+( + + + )+......+( + + +......+ )