A.720÷45×2 | B.720÷2÷45 | C.720÷2×45 |
A.38×100+3 | B.38×103-3 | C.38×100+38×3 | D.38×103-38×3 |
A.100×125+2 | B.100×125+2×125 ![]() | C.100×125×2 |
A.63×100+1 |
B.63×100-1 |
C.63×100+63 |
A.345÷10÷5 | B.345÷5÷3 | C.345÷5×3 |
A.乘法交换律和结合律 | B.乘法交换律和分配律 | C.乘法结合律 |
A.288÷18×2 | B.288÷6÷6 | C.288÷4÷9 |
A.4×7×5×3=(4×5)×(7×3) |
B.12×39+11×12=12×(39+11) |
C.56×7=7×56 |
D.1900÷4÷25=1900÷(4×25) |
A.102×56=(100+2)×56=100×56+2×56=5600+112=5712 |
B.41×61+39×41=41×(61+39)=41×100=4100 |
C.5×28+65×72=(35+65)×(28+72)=100×100=10000 |
A.乘法交换律 | B.乘法结合律 | C.乘法分配律 |