问题
单项选择题
31.21×16+3.121×120+312.1×6.2的值是______。
A.3121
B.2808.9
C.4125
D.3768
答案
参考答案:B
解析:原式=31.21×16+3.121×120+312.1×6.2=31.21×16+31.21×12+31.21×62=31.21×(16+12+62)=31.21×90,估算可知尾数为0.9。故选B。
31.21×16+3.121×120+312.1×6.2的值是______。
A.3121
B.2808.9
C.4125
D.3768
参考答案:B
解析:原式=31.21×16+3.121×120+312.1×6.2=31.21×16+31.21×12+31.21×62=31.21×(16+12+62)=31.21×90,估算可知尾数为0.9。故选B。