问题
选择题
计算(0.27+0.27+0.27+0.27)×2.5既正确又简单的算式是( )
A.0.27×2.5+0.27×2.5+0.27×2.5+0.27×2.5
B.0.27×4×2.5
C.0.27×(4×2.5)
D.0.27×(2.5+4)
答案
(0.27+0.27+0.27+0.27)×2.5,
=(0.27×4)×2.5,
=0.27×(4×2.5),
=0.27×10,
=2.7;
故选:C.