问题
解答题
用脱式计算: (1)(
(2)
|
答案
(1)(
+7 8
-7 12
)×96,5 6
=
×96+7 8
×96-7 12
×965 6
=12×7+8×7-5×16,
=(12+8)×7-5×16,
=140-80,
=60;
(2)
÷[(1 5
+2 3
)×1 5
],1 13
=
÷[(1 5
+10 15
)×3 15
],1 13
=
÷(1 5
×13 15
),1 13
=
÷1 5
,1 15
=3.