A.105° | B.130° | C.75° |
A.加法交换律 | B.加法结合律 | C.加法交换律和加法结合律 |
A.1330 | B.1270 | C.1350 |
A.402200 | B.300520 | C.602090 |
A.12.5×10 | B.12.5×6 | C.7.5×12.5 | D.7.5×6 |
A.30个1 | B.30个0.1 | C.30个0.01 | D.30个0.001 |
A.5.4 | B.6.0 | C.6.3 |
A.形状和大小 | B.形状和方向 | C.大小和方向 |
A.60° | B.90° | C.120° | D.180° |
A.1 | B.2 | C.3 | D.4 |