1、计算题专题练习一、 竖式计算。1、(得数保留一位小数)0.38 0.235.79 3.64.60.256 2452.95753.01 7 4.95 1184.01 31 0.646 19 4.7 0.5931.24 1521 2409.68163.85 0.763、得数用循环小数表示。0.2 0.0613 1130.13317 158 7二、能简便计算的要简便计算2.5 3.6 0.912.5 0.3 8.81.25 (1008)42(5.25 0.25)0.4 12.60.28 0.28.4 8.4 1.5 1.812.5 4.5+4.5 12.5+12.51.2 982.41.25 0.3
2、118 (11.4 12.5 0.8) 50 (6.7 0.02)(0.25 2.5 25) 0.43.51.02+35 0.098 0.27 99 0.272.5 3.20.12513.52.5 0.125 0.48 )2.85 1.25 0.810.5 0.25 123.791.6+7.3 91.6 91.6 12.5 0.4 2.582.06 2.06 99三、解方程8x24x 0.5 1.2 x3.8=9.534.06 x=7.11x 1.5=1.52.4x=26.43x24=913x+2 7=408.9 5x=2.73.54 5 1.7x=13.451.6x 2x 0.7=18966
3、+4x=56 3x 1.2x=93.6x2 1.4 8.2180.6 10x=4.264x0.32 1.6=2.0828 x 3.6 203.5x 0.8x 11.340.4( x 3) =0.721.5( 10x) =32.8( 3x) =3.50.29x145.5 586.2x x41.62.8 (3 x)=3.5 0.29x 5.2 6=4.8(2.5 x)0.8=50.5 (x 1.8)=2.422.5 2 5x=1354(0.3 x)=4.80.4 20 0.4x=63x+27=5012 (x 3.7)1445x 3 11=42(4x 0.32)1.6=2.083.5x x=17.54x 10=x 1107.2x 3.6x 9 0.40.4 20 0.4x=624x 8x=28.8(x 6) 0.5=34x45 18=21 1.6x 9=3.8