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下面各题,能简算的要用简便方法计算.2.9+0.46+7....

①2.9+0.46+7.1+0.54=(2.9+7.1)+(0.46+0.54)=10+1=11;②

9/7-(2/7-10/21) =9/7-2/7+10/21 =1+10/21 =1又10/21

15.7 - ( 5.7 - 2.8 ) = 15.7 - 5.7 + 2.8 = 12.8 4/

2/9-7/16×2/9=1/8 方法一(简便运算): 2/9-7/16×2/9 =2/9×(1-7

(1)198-600÷25×4=198-24×4=198-96=102;(2)51×9.9+5.1=

(1)9.06-2.68-0.32,=9.06-(2.68+0.32),=9.06-3,=6.06;

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