A.53与a3 | B.7x与7y |
C.3m3n2与-3m2n3 | D.2πR与4R |
A.-a+b-c+d | B.-a-b+c+d | C.-a+b-c-d | D.-a+b+c+d |
A.m=1,n=0 | B.m=2,n=1 | C.m=1,n=2 | D.m=0,n=1 |
2 |
3 |
1 |
2 |
A.a2-2a-b+c=a2-(2a-b+c) |
B.(a+b)-(-d+c)=a+b+c+d |
C.2a-7b+3c-1=2a-[7b-(3c-1)] |
D.a-(b+c-d)=a-b+c-d |
© 2017-2019 超级试练试题库,All Rights Reserved.