问题
解答题
|
答案
(1)(
+2 7
)×35,1 5
=
×35+2 7
×35,1 5
=10+7,
=17;
(2)
×[8 9
-(3 4
-7 16
)],1 4
=
×[8 9
-(3 4
-7 16
)],4 16
=
×[8 9
-3 4
],3 16
=
×[8 9
-12 16
],3 16
=
×8 9
,9 16
=
;1 2
(3)
+1 13
×(12 13
-5 2
),1 3
=
+1 13
×(12 13
-15 6
),2 6
=
+1 13
×12 13
,13 6
=
+2,1 13
=2
;1 13
(4)3.5×72+65×7.2,
=35×7.2+65×7.2,
=(35+65)×7.2,
=100×7.2,
=720;
(5)120÷[4.5×(1-
)],8 9
=120÷[4.5×
],1 9
=120÷0.5,
=240;
(6)
-(11 15
-3 5
),4 15
=
-11 15
+3 5
,4 15
=(
+11 15
)-4 15
,3 5
=1-
,3 5
=
.2 5