A.无数 | B.10 | C.9 | D.0 |
A.327-(2.63+0.37) | B.327-0.37-2.63 |
A.加法交换律 | B.加法结合律 | C.加法交换律和结合律 |
A.(8.28+2.69)+4.72 =(8.28+4.72)+2.69 =13+2.69 =15.69 |
B.(8.28+2.69)+4.72 =8.28+2.69+4.72 =10.97+4.72 =15.69 |
C.(8.28+2.69)+4.72 =2.69+8.28+4.72 =2.69+13 =15.69 |
A.6.67-3.67+0.49 |
B.6.67+(0.47-3.67) |