题目
用简便方法计算.
(1)
( + ﹣ )÷
(2)
×100
(3)
0.125×0.25×64.
答案: ( 49 + 56 ﹣ 718 )÷ 136 =( 49 + 56 ﹣ 718 )×36 = 49 ×36+ 56 ×36﹣ 718 ×36 =16+30﹣14 =32
725 ×100 17 = 725 ×(100+ 17 ) = 725 ×100+ 725 × 17 =28+ 125 =28 125 ;
0.125×0.25×64 =0.125×0.25×(8×4×2) =(0.125×8)×(0.25×4)×2 =1×1×2 =2.