问题
解答题
怎样简便怎样算:
|
答案
(1)
÷210 13
-119 22
×2 5
÷7+11 13
×1 5
,22 63
=
×10 13
-22 63
×7 5
×11 13
+1 7
×1 5
,22 63
=
×10 13
-22 63
×1 5
+11 13
×1 5
,22 63
=(
+10 13
)×1 5
-22 63
,11 65
=
×63 65
-22 63
,11 65
=
-22 65
,11 65
=
;11 65
(2)(
-4 5
+1 6
)×60,5 12
=
×60-4 5
×60+1 6
×60,5 12
=48-10+25,
=38+25,
=63;
(3)1994×19931994-1993×19941994,
=1994×19931994-1993×1994×10001,
=1994×19931994-1994×19931993,
=1994×(19931994-19931993),
=1994×1,
=1994;
(4)(20.2×0.4+7.88)÷4.2,
=(20.2×0.4+7.88)÷4.2,
=(8.08+7.88)÷4.2,
=15.96÷4.2,
=3.8.