问题
解答题
|
答案
①
-0.375+5 9
-11 18
,5 8
=
-5 9
+3 8
-11 18
,5 8
=(
+5 9
)-11 18
-3 8
,5 8
=(
+5 9
)-(11 18
+3 8
),5 8
=
-1,7 6
=
;1 6
②12.5×0.32×25,
=12.5×0.8×0.4×25,
=(12.5×0.8)×(0.4×25),
=10×10,
=100;
③
÷6+9 20
×1 6
,1 20
=
×9 20
+1 6
×1 6
,1 20
=(
+9 20
)×1 20
,1 6
=
×1 2
,1 6
=
;1 12
④
×0.25+5 6
×1 4
,1 6
=
×5 6
+1 4
×1 4
,1 6
=(
+5 6
)×1 6
,1 4
=1×
,1 4
=
.1 4