问题
解答题
|
答案
(1)48×
+3÷73 7
=48×
+3 7
,3 7
=(48+1)×
,3 7
=49×
,3 7
=21;
(2)
×7 18
+1 4
×3 4 7 18
=(
+1 4
)×3 4
,7 18
=1×
,7 18
=
;7 18
(3)
×[3 10
÷(7 8
-3 5
)].1 4
=
×[3 10
÷(7 8
-12 20
)],5 20
=
×[3 10
×7 8
],20 7
=
×3 10
,20 8
=
.3 4