A.50.09 | B.4.005 | C.7.0900 |
A.0个 | B.1个 | C.3个 | D.无数个 |
A. | B. | C. | D. |
A.2.4﹣1.5 | B.0.7+0.9 | C.3.1﹣1.3 |
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.80.41-25.41-(6.28+3.72) | B.80.41-25.41-6.28-3.72 |
A.15.73-6.25-3.73 | B.15.73-3.73-6.25 |