问题
解答题
|
答案
①(
-1 2
)×142 7
=
×14-1 2
×14,2 7
=7-4,
=3;
②
×4 13
+1 7
×4 13 6 7
=(
+1 7
)×6 7
,4 13
=1×
,4 13
=
;4 13
③15×(9.6-8.6)÷1.2
=15×1÷1.2,
=15÷1.2,
=12.5;
④15-
-9 20 3 5
=15-
-9 20
,12 20
=14
-11 20
,12 20
=13
;19 20
⑤(10×
+6)×2 5 13 14
=(4+6)×
,13 14
=10×
,13 14
=
;65 7
⑥
×[1-(2 3
-1 3
)]×1 4 5 11
=
×[1-(2 3
-4 12
)]×3 12
,5 11
=
×[1-2 3
]×1 12
,5 11
=
×2 3
×11 12
,5 11
=
.5 18