68/5×69,7/4×50-7/4,16.837-(3/2+6.837),0.99×99+0.99,用简便计算怎么做
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68/5×69,7/4×50-7/4,16.837-(3/2+6.837),0.99×99+0.99,用简便计算怎么做
68/5×69,7/4×50-7/4,16.837-(3/2+6.837),0.99×99+0.99,用简便计算怎么做
68/5×69,7/4×50-7/4,16.837-(3/2+6.837),0.99×99+0.99,用简便计算怎么做