1、0.1 0.231.2 1.57.4 11.25.6 2.880.96 76.40.45 7.14.29 三、简便计算。3.9 6.9 3.1 3.9 5.4 4.52 5.48 29.6( 5.5 2.5 ) 2 2.5 9.9 0.25 5.82 0.35 5.82 0.65 3.4 0.5 20 四、解方程。20x449 x17 5.1x3.9x1.2 10(x7)1 x8.470.8 16x0.96.4 10x158 x0.410 5.1x3x3.99 5(x2)60.3 x7.310.6 25x0.77.4 3 2.10.2 130.05 10.8 4 6.30.9 0.540.6
2、10.2 2.43 40.5 120.05 1.10.60.05 2.20.3 0.130.6 0.12 989.8 50.36 0.220.4 3.19.6 364.58.1 2.730.91 57.10.15 7.44.4 4.1 5.3 4.7 4.1 2.4 5.57 4.43 24.6( 8.5 3.5 ) 2 1.1 9.9 0.11 3.64 0.12 3.64 0.88 9.3 0.2 500 16x155 x2.511 8.2x1.7x16.25 2(x7)3.1 x1.730.6 25x0.49.3 16x441 x2.68 7.5x2.4x8.67 4(x4)70.8 x
3、2.10.7 20x0.56.2 1.33 3.10.2 0.140.2 1.10.7 1.65 1.80.2 1.20.7 0.120.6 0.90.08 10.5 0.10.5 0.221.45 2.90.2 10.5 0.110.6 201.68.4 7.380.56 0.767 1.058.3 114.88.2 0.330.11 18.90.33 9.13.83 4.4 2.2 17.8 4.4 6.9 5.97 4.03 9.1( 6.5 0.5 ) 2 6.5 9.9 0.65 1.92 0.47 1.92 0.53 3.9 2.5 0.4 32x847 x2.813 5.4x1.
4、9x9.8 8(x6)3 x2.110.2 10x0.44.1 5x621 x3.311 5.9x1.7x11.76 10(x2)71.5 x8.840.8 20x0.68.4 1.15 3.10.3 0.160.3 0.222 30.6 0.451.5 1.10.3 4.812 3.10.3 0.150.6 0.120.20.07 2.90.3 0.281.4 1292.84.8 4.360.14 0.081.6 6.322.8 60.24.3 2.10.3 43.70.96 8.63.44 7.1 4.2 5.8 7.1 2.8 2.61 7.39 47.2 2 3.8 9.9 0.38
5、7.09 0.28 7.09 0.72 4.9 0.25 400 10x944 x4.719 5.9x0.8x13.26 4(x5)8.2 x1.190.9 25x0.88.9 4x934 x1.311 8.5x0.4x17.01 4(x2)66.8 x7.930.1 64x0.79.3 1.32 2.40.3 1.10.8 0.131.32 1.20.3 0.120.4 0.190.82 1.60.3 0.10.4 12 30.2 120.05 0.12442.26.7 6.70.29 0.057.4 3.45.1 128.16.1 40.8 78.40.47 6.81.7 8.1 3.3
6、16.7 8.1 1.3 1.52 8.48 37.7 4 5.8 9.9 0.58 1.63 0.53 1.63 0.47 4 x221 x3.38 9.3x3.1x7.44 2(x2)2.9 x6.90.8 4x0.74.8 16x139 x1.813 7.2x3x10.5 10(x1)82.8 x8.480.1 4x0.74.3 3 2.10.7 0.480.8 0.330.11 0.06 2.80.3 0.140.5 1.20.40.04 2.70.2 0.150.3 0.233 0.60.6 0.164085.1 7.930.75 0.461.1 8.824.4 248.27.3 2.680.67 10.20.27 9.43.03 3.5 7.9 2.1 3.5 2.5 1.02 8.98 12.5 6 2.8 9.9 0.28 6.28 0.81 6.28 0.19 4.2 0.125 800 2x148 x0.213 9.1x0.5x13.76 10(x8)5.3 x2.350.8 8x0.78.1 64x236 x0.411 8.2x3.7x4.5 5(x5)82.3 x8.630.8 x0.86
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