(2004•茂名)马大哈同学做如下运算题:①x5+x5=x10,②x5-x4=x,③x5•x5=x10,④x10÷x5=x2,⑤(x5)2=x25其中结果正确的是( )
A.①②④
B.②④
C.③
D.④⑤
0 170413 170421 170427 170431 170437 170439 170443 170449 170451 170457 170463 170467 170469 170473 170479 170481 170487 170491 170493 170497 170499 170503 170505 170507 170508 170509 170511 170512 170513 170515 170517 170521 170523 170527 170529 170533 170539 170541 170547 170551 170553 170557 170563 170569 170571 170577 170581 170583 170589 170593 170599 170607 366461
A.①②④
B.②④
C.③
D.④⑤