求阴影部分的面积.
口算下面各题. 0.7+2.8= 7.3﹣0.6= 0.84÷0.2= 0.12×0=0.4×0.05= 0.5÷100= 5.2+3.8= 1.45+5.5=
口算.7.5+9.2= 9﹣2.7= 16﹣0.9= (2.5+0.25)×4=4.5÷0.9= 8.5×10= 5.2÷0.2= 0.5+1.5÷1.5﹣0.5=
直接写得数.4.8+5.5=,+=,100﹣23.5=,++1=,0.35+0.75=2.8﹣0.16﹣0.84=6.5×0.1=
直接写出得数.99÷100= 0.2×8= 12.5×8= 6.2+0.04=2.5×0.4= 6﹣0.7= 6.4+4.6= 0.04×0.3=2.4×0.5= 0.5×2.4= 2.1﹣2.01= 0.6×0.7=
6﹣3.4= 160×60= 0.5+2.37= 7.6+2.4=1.6﹣0.7= 6÷1000= 0.009×100= 45÷3=