直接写出得数
+= | 1+= | -= | -= |
2-= | += | -= | += |
3-= | 2+= | 1.5-= | 0.5+= |
2.5+= | +0.5= | -0.25= | -0.7= |
笔算
483+274= | 709-573=验算 | 325+464=验算 | 71÷9= | 313×5= | 309×4= |
+= | 1+= | -= | -= |
2-= | += | -= | += |
3-= | 2+= | 1.5-= | 0.5+= |
2.5+= | +0.5= | -0.25= | -0.7= |
483+274= | 709-573=验算 | 325+464=验算 | 71÷9= | 313×5= | 309×4= |