5.2×9.9+5.2×0.1 9.73×2.5×0.4 9分之8×【4分之3-(16分之7-4分之1)】能简便的要简便
问题描述:
5.2×9.9+5.2×0.1 9.73×2.5×0.4 9分之8×【4分之3-(16分之7-4分之1)】能简便的要简便
答
5.2×9.9+5.2×0.1 =5.2× (9.9+0.1) =5.2× 10 =52 9.73×2.5×0.4 =9.73×(2.5×0.4) =9.73× 1 =9.73 9分之8×【4分之3-(16分之7-4分之1)】 =8/9× [ 3/4 -7/16+1/4] =8/9×[ 1-7/16] =8/9×9/16 =1/2