.5÷212.5×8.8 (125-1.25)×0.8 3.5×0.4+3.5×0.6三、竖式计算。 0.3÷0.12=104.78÷26≈34.2÷0.8=(得数保留一位小数) 验算计算练习九一、直接写得数2.5×0.4= 2.4×5= 0.22×4= 0.9-0.52= 3.99×1= 0×3.52= 2.5÷5= 8.4÷7=二、下列各题怎样算简便就怎样算39÷(1.3×5) 2.2÷4+0.6÷4 4.83÷5+2.17÷542÷3.5 26.7-0.5×5-7.5 48.4+2.78+51.6-0.48三、竖式计算。 52.78÷26=1.86×0.47=3.81÷7≈(得数保留两位小数)验算: 计算练习十一、直接写得数0.8×7= 1.5×7= 1.02×8= 10.3×2=5×0.6= 0.9×0.3= 3.5×0.2= 2.01×0=二、下列各题怎样算简便就怎样算4.8+8.63+5.2+0.37 5.93+0.19+2.81 1.76+0.195+3.24 2.35+1.713+0.287+7.65 1.57+0.245+7.43 6.02+3.6+1.98 计算练习十一一、直接写得数10×0.05= 0.13×7= 0.21×100= 0.7×4=0.05×4= 4×0.3= 2.3×4= 3.25×0=二、下列各题怎样算简便就怎样算0.134+2.66+0.866 1.27+3.9+0.73+16.1 7.5+4.9-6.5 3.07-0.38-1.62 1.29+3.7+2.71+6.3 8-2.45-1.55