计算图形的面积。(单位:cm)
0.25×0.99×40.
1.5×1.3×4 2.7+3.1+2.9+3.2 25﹣4.9﹣6.13.5×4.8+2.2×2.4 131+132+130+129 (13+5.2)÷1.3.
计算下面各题,能简便计算就简便计算.429+31.1+2.04 100﹣27.2﹣42.8 9﹣(3.02+1.25) 1.8﹣1.57+0.2.
脱式计算.3.6×10.1 5.2×(4.7﹣1.9) 0.98+4.3×1.25.
脱式计算.(能简便的要用简便方法算)4.2+7.64+5.8+2.36 14.28﹣2.63﹣7.37 6.8+5.26+3.74+3.28.2×101﹣8.2 (520+480)÷50×4 400﹣(1300÷65+35)