下面是张大妈家一块地的平面图,请算出实际的菜地面积.
脱式计算(能简算的要用简算)14.6﹣4.6×2.8 12.5×0.4×2.5×8 4.2×1.25+4.8×1.25﹣1.255.96+13×(3.2﹣3.12) 13.5×102 0.17×40+0.017×600+1.7×10.
简算.1.25×10.7×8 10﹣(0.56×8.3+0.44×8.3)49.8×2.73+2.73×50.3+0.273 1414÷3.5.
脱式计算,能简便的要用简便方法计算.0.389×4×0.25 4.02×3.02+4.02×6.984.05÷0.81+2.4 65.4÷2.5÷486×9.9 1.76﹣[(0.74+0.26)÷0.8].
脱式计算.(能简算的要简算)12.56﹣6.64﹣3.36 45.5﹣(0.98+5.5)13.6+7.94+6.4 15.19+3.36+4.64+4.81.
怎样简便就怎样算.9.4+0.3﹣6.4 15.25+4.72+4.75+5.28 34.823﹣(4.82+15.2)12.7﹣4.8﹣5.2 3.1+25.78+6.9 73.8﹣1.64﹣13.8﹣5.36.