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1、用简便方法计算4.8+8.63+5.2+0.375.93+0.19+2.811.76+0.195+3.242.35+1.713+0.287+7.65 1.57+0.245+7.436.02+3.6+1.980.134+2.66+0.8661.621.27+3.9+0.73+16.1 3.07 0.38 8-2.45 1.5523.4 0.8 13.4 7.20.32 X 4030.25 X 3612.7 (3.7 + 0.84 )36.54 1.76 4.541.28 X 8.6 + 0.72 X 8.60.8 X (4.3 X 1.25)(4.23 + 6.17 ) X 0.814-7.32
2、 2.68 2.6412.5X0.96 X 0.810.43.12+ 3.12 X 9928.60.86X15.7 0.86 X 14.7+ 8.67 + 7.36 + 11.33 2.31 9.6 X0.35X101 28.62.4 X102X1.2 X 0.59.9 X 48+2(23X4) X 150.86 X 15.7-0.86 X 14.748 X 0.56+44 X 0.480.2790.264 X 519+264X 0.481 9.16X 343+0.657 X 279 12.5 X 8.8X 1.53-0.053 X 91.6 99 X 0.32.5 X 324.56 X 0.
3、4 X 2.5 12.5 X 2.7 X 0.8 12.5 X 32 X 0.2595.7 X 0.28+6.3 X 0.28-0.28 X 20.25 X 48 5 X 1.03 X 0.0299.99 x 0.8+11.11 x 2.832 X 1.25 0.45 X 999.99 X 2.22+3.33 X 3.34314530.125X 0.043 + 3.14 X 7.2-31.4 X 0.15X10.1 4.2 X 6.51+3.49 X 4.2X96 12.5 X 10.82. 50.456.8 X 0.04X 2010.25 X 32 X 0.1250.58 x 10.16.4 X 1.2550.2 x 9912.54.79.9(20-4) X 0.254.8 X100.13.28X 5.7 + 6.72 X 5.70.25 X 32 X 0.1252 .5 X (4 +0.4)2.1 X 99 + 2.1(1.25 0. 125) X 84.2 X 9956.5 X 9.9 + 56.57.09 X 10.8 0.8 X 7.093.83 X 4.56 + 383X 0.05443.65 X 4.7 36.5 X 0.374X (2.5X 65+25X2 .8)3.1X 870+0. 13X 31007.8x10.2