我会用竖式笔算下面各题.
①476×8= | ②208×5= | ③409-394= | ④507-348= |
解方程.
2x+9=33 | x÷10=12.5 | 3.8x-x=0.56 | 7x+5x=120. |
求未知数x
x+x-1=4 | :x=3:4 | 19-12%x=7 |
3x+60%x=72 | x-5%x=17.5 | 2x+30%x=9.2. |
①476×8= | ②208×5= | ③409-394= | ④507-348= |
2x+9=33 | x÷10=12.5 | 3.8x-x=0.56 | 7x+5x=120. |
x+x-1=4 | :x=3:4 | 19-12%x=7 |
3x+60%x=72 | x-5%x=17.5 | 2x+30%x=9.2. |