问题
解答题
怎样简便就怎样计算. ①4×
④8.5-(5.6+4.8)÷1.3⑤12×(
|
答案
①4×
+4÷2 7
,7 5
=(
+2 7
)×4,5 7
=1×4,
=4;
②5×
×1 3
×4 5
,3 10
=(5×
)×(4 5
×1 3
),3 10
=4×
,1 10
=
;2 5
③41×101,
=41×100+41×1,
=4100+41,
=4141;
④8.5-(5.6+4.8)÷1.3,
=8.5-10.4÷1.3,
=8.5-8,
=0.5;
⑤12×(
+1 4
-1 6
),1 3
=12×
+12×1 4
-12×1 6
,1 3
=3+2-4,
=1;
⑥
-(11 13
-8 9
),1 13
=
+11 13
-1 13
,8 9
=
-12 13
,8 9
=
.4 117