问题
解答题
|
答案
①[3.2×(1-
)+35 8
]×23 5
,1 12
=[3
×(1-1 5
)+35 8
]×23 5
,1 12
=[3
×1 5
+33 8
]×23 5
,1 12
=(
+6 5
)×18 5
,25 12
=
×24 5
,25 12
=10;
②1
+23 7
+44 15
+34 7
,2 15
=(1
+43 7
)+(24 7
+34 15
),2 15
=6+5
,2 3
=11
;2 3
③
×99,43 97
=
×(97+2),43 97
=
×97+43 97
×2,43 97
=43+
,86 97
=43
;86 97
④3.75×4
+1.6×32 5
,3 4
=3.75×4.4+1.6×3.75,
=3.75×(4.4+1.6),
=3.75×6,
=22.5;
⑤1÷2.5+2.5×0.4,
=0.4+2.5×0.4,
=0.4×(1+2.5),
=0.4×3.5,
=1.4;
⑥3
-12 5
-3 4
,1 4
=3
-(12 5
+3 4
),1 4
=3
-2,2 5
=1
.2 5