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.4×25×11 | B.40×25+4×25 |
C.(4×5)×(11×5) | D.44×5×5 |
A.少1 | B.少2 | C.多2 |
A.(47×5)×12=47×(5×12) | B.a×b×a×c=a×(b×c) | C.4×a×5=a×(4×5) |
A.288÷18×2 | B.288÷6÷6 | C.288÷4÷9 |
A.加法交换律 | B.加法结合律 | C.减法的运算性质 |
A.118 | B.62 | C.58 |
A.34+47=47+34 | B.62+(47+68)=(62+68)+47 | C.57+24+76=57+(24+76) |