小学数学毕业分类训练：计算.doc

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1、Four short words sum up what has lifted most successful individuals above the crowd: a little bit more.-author-date小学数学毕业分类训练：计算小学数学毕业分类训练：计算小学数学毕业分类训练：计算经一、直接写出得数。 5673987.6 3.18 + 6.82 = 365198 = 10.1 = 20.42 = 99911999 = 21.516.07 = 178 = 3020 = 373 = 245 = 0.34 = 10.1 = 0.340 = 425% = 1.258 = 10

2、00.15% = 3.148% = 68 = 10.1 = 11% = 2.48 = 680.4% = 1.20.3 = 0.0566 = 646432 = 8.2 + 0.54 + 0.46 = 2030.130.87 = 17254= 2.53.21.25 = 400258= 4.023.5+0.98 = 11.250.8 = 1999 + 999999 = 4.99 + 4.9= 7.8117.8 = 6.133.52 + 4.876.48 = 5515 = 7.52.3 + 3.12.5 = 4(0.71.8)= 1.2517.636.10.82.6312.5 =+ = + = 8.2

3、 + = 2.25 + 1= + 20% = 1- = - = 0.5 - = 2- 0.25 = = 413 = 4.5 = 02= 5 = 8= 155 = 60% = 1 4= 7+ + 0.6= 40.3751= 1.2532= = 2+ = 333= 37= 0.375 + 7= 1+11= 0= 1= + = 1(33.09)= 1+ = 0.91+ 9.1= 1000.11= 4+ 4= (3+ 2)= (0.18+ )9= ( )9= (6.755)2= 4(3+ 0.73)= 3(0.75)= 0(1+ )= (20.4)(1)= 1.91.9(1.9)0.38=二、用简便方

4、法计算12.556 1450499 125160.5 17.093.636.37 1999+199999 2.83+3.3+0.17+7 1.254.80.25 234.2+0.235809.98.4+8.48.40.9 3.358.42+6.71.6 （2.5-2.50.6）0.4 1.25（8+0.8）+892.5（19+191919） 189 29 1 832.25 84.653 12.285-3.625 25.125217.4 11 1.25814 1.75+4+10.4+3 156.28 3.72+4 990.75+ 99 1+1.4 6.752+ 42.50.242.4 35()

5、(+ )15.73(2+ 1.73) 24(+ ) (1) (+ )8 + (+ -)49 16(9+ 6.65) (910)1 5(+ )2 4.5(1+)- 1.755.53(4- 2)+ + + 22 1+ 2 50.4+ 5.2540% 86+ 86三求未知数x。x4.5 = 6.9 4.5x +1.3x = 17.4 x + 6=10 + 0.6x 5x -1.6 = 0.9 83 -16x = 3 20 - 0.4x=41.8 5.2x 1.3x=1.56 12.82.4x = 4（x + 2） 19 + 3xx = 20 8x325 = 400 61.5 + 5x = 12 23

6、 + 8x = 425 3648x = 56 5（6 + x）= 124 （140x）16 = 480 50.5 ：x = 2.5 ：20 =15% = :18% = = = = = 3x + 1.2 = 4 6+ 4x = 7 3x1 = 4x6 = 7.5 35x = 0.6 3.6x = 2 xx = x= 20 x= 2.5 x ：= 2 ：1 x ：= 9.6 ：20% 3.2 ：x = 8 ：1 4：x = 0.3：10 ：x = 4.5 ： 3：x = 1：0.6 1：= x ：8 2：3= x ：0.2 4.5 ：= x ： 0.3 ：= x：1 ：= 0.75 ：x 0.8 ：=0.24 ：x 0.16 ：= ：x ：= 1：x 2x1.652.357 7.5:x24:128X5.5X=1 0.368=X25 4X = 8（x2）= 2(x7)-