（1）1/2*3+1/3*4+1/4*5.1/2006*2005 （2）1/2+1/（1+1）*（2+1）+1/（1+2）*（2+2）.1/（1+2009）*（2+2009） （3）1+1/（1+2）+1/（1+2+3）+.1/（1+2+3+4.100）

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• 2. What can be calculated simply should be calculated simply (1) 6 / 7 - (3 / 10-1 / 7) + 7 / 10 (2) (1 / 2 + 5 / 12 × 2 / 3) △ 7 / 9 (3) 36 × 5 / 6 + 5 / 6 × 0.64 (4) 5x of 6 + 1 of 6 = 8 of 9 （5）0.69+0.53+2.47+0.31
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• 5. There are 100 equations and 200 mixed operations in Grade 6 of primary school. The faster the better,
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