问题
解答题
计算下面各题,能简算的简算. ①
②58×102 ③
④0.888×125×73+999×73. |
答案
①
÷5 12
+15 21
×1 4
,3 5
=
×5 12
+21 15
×1 4
,3 5
=
+7 12
,3 20
=
;11 15
②58×102,
=58×(100+2),
=58×100+58×2,
=5800+116,
=5916;
③
×[9 18
-(3 16
-7 16
)],1 4
=
×[9 18
-3 16
],3 16
=
×0.9 18
=0;
④0.888×125×73+999×73,
=[(0.8+0.08+0.008)×125]×73+999×73,
=[0.8×125+0.08×125+0.008×125]×73+999×73,
=[100+10+1]×73+999×73,
=111×73+999×73,
=(111+999)×73,
=1110×73,
=81030.