14.直接写出得数.
9.8-6.2= | $\frac{1}{5}$+$\frac{1}{6}$= | $\frac{3}{4}$×24= | 4.2÷0.01= |
0.25×40= | $\frac{5}{14}$-$\frac{2}{7}$= | 16×29×0= | $\frac{3}{8}$÷$\frac{1}{2}$= |
13.一个圆的半径增加2厘米,那么周长增加( )厘米.
A. | 6.28 | B. | 12.56 | C. | 18.84 | D. | 无法确定 |
12.下面不能围成正方体的是( )
A. | B. | C. |
11.一块平行四边形的菜地,底是450米,高是200米,这块菜地有( )公顷.
0 163889 163897 163903 163907 163913 163915 163919 163925 163927 163933 163939 163943 163945 163949 163955 163957 163963 163967 163969 163973 163975 163979 163981 163983 163984 163985 163987 163988 163989 163991 163993 163997 163999 164003 164005 164009 164015 164017 164023 164027 164029 164033 164039 164045 164047 164053 164057 164059 164065 164069 164075 164083 199269
A. | 9 | B. | 90 | C. | 900 | D. | 90000 |