A.8 | B.5 | C.7 | D.1 |
A.111111 | B.1111111 | C.11111111 |
A.减45 | B.减90 | C.加45 | D.加90 |
A.1640 | B.13002 | C.2000 | D.6021 |
A.245 | B.240 | C.235 |
A.20块 | B.30块 | C.40块 |
A.商不变的性质 | B.乘除法的关系 | C.小数的性质 |
A.5+15="15+5" | B.89+68+32=89+(68+32) |
C.12×5=5×12 | D.77×4×25=77×(4×25) |
A.ON | B.OFF | C.CE |
A.48+32÷2×3 | B.(48+32)÷2×3 | C.(48+32)÷2﹣3 | D.(48+32)÷(2×3) |