画一个平行四边形,并作出它的一条高.
5×1.3÷5×1.399×10.158×10.1﹣5.8128.8÷23+9.2×0.35.
能简算的要简算0.76×230﹣30 9.2×l.85+3.65 (7.39+7.39+7.39+7.39)×2.50.78×101 0.25×28 4.2×l.36+1.36×5.8.
计算下面各题.3.52+8.4+2.6 5.94+6.7+1.06+0.342.24﹣6.24﹣3.76 4.92+3.27﹣4.92+3.73.
8.4×2.5+7.185.81﹣0.25×1.60.8×630×0.125.
3.5×4.8+2.2×2.4.