问题
选择题
计算9.9×37的简便方法是( )
A.9×0.9×37
B.(10-0.1)×37
C.(10-1)×37
D.4.9×5×37
答案
9.9×37,
=(10-0.1)×37,
=10×37-0.1×37,
=370-3.7,
=366.3.
故选:B.
计算9.9×37的简便方法是( )
A.9×0.9×37
B.(10-0.1)×37
C.(10-1)×37
D.4.9×5×37
9.9×37,
=(10-0.1)×37,
=10×37-0.1×37,
=370-3.7,
=366.3.
故选:B.