A.除、加、减、乘 | B.加、除、减、乘 |
C.除、减、加、乘 |
A.3×[4×(4.25+2.4)] |
B.3×(4×4.25+2.4) |
C.(3×4)×(4.25+2.4) |
A.加法 | B.乘法 | C.减法 | D.除法 |
A.58-27+36 24÷3×7 | B.45+64÷8 (45+35)÷8 | C.63÷7×4 63-7×4 |
A.2 | B.3 | C.6 |
A.乘法结合律 | B.加法结合律 | C.乘法分配律 |
A.280-15 | B.15×14 | C.14÷7 | D.280-14 |
A.3 | B.5 | C.2 |
A. 19×29 | B.31×21 | C.26×22 |
A.1-0.2÷1-0.2=1 | B.1-0.2÷1-0.2=0.6 | C.1-0.2÷1-0.2=0 |