4.口算
8×125= | 240÷30= | 1-0.25= | 3.8+2= |
4.3-0.8= | 3.26÷100= | 4.9×1000= | 760-10×50= |
200÷5÷4= | 25×4÷25×4= | 45÷(3×5)= |
3.下面哪个算式是正确的.( )
A. | 99+1×23=100×23 | B. | 201×50=200×50+1 | C. | 75+34+66=75+100 |
2.下面哪组线段长度不能围成三角形( )
0 156787 156795 156801 156805 156811 156813 156817 156823 156825 156831 156837 156841 156843 156847 156853 156855 156861 156865 156867 156871 156873 156877 156879 156881 156882 156883 156885 156886 156887 156889 156891 156895 156897 156901 156903 156907 156913 156915 156921 156925 156927 156931 156937 156943 156945 156951 156955 156957 156963 156967 156973 156981 199269
A. | 5cm 5cm 9cm | B. | 6cm 7cm 8cm | C. | 4cm 4cm 8cm |