问题
解答题
4
25×(8×0.4)×1.25= 7
(
93.5÷3
16÷2.5=. |
答案
(1)4
+3.2+51 3
+6.8,2 3
=4
+31 3
+51 5
+62 3
,4 5
=(4
+51 3
)+(32 3
+61 5
),4 5
=10+10,
=20;
(2)25×(8×0.4)×1.25,
=(25×0.4)×(8×1.25),
=10×10,
=100;
(3)7
-(24 15
-4 15
),1 23
=7
-24 15
+4 15
,1 23
=5+
,1 23
=5
;1 23
(4)(
+11 12
+7 18
)×72,5 24
=
×72+11 12
×72+7 18
×72,5 24
=66+28+15,
=109;
(5)93.5÷3
÷1 2
,2 7
=93
÷31 2
÷1 2
,2 7
=93
÷(1 2
×2 7
),7 2
=93
÷1,1 2
=93
;1 2
(6)16÷2.5,
=(16×4)÷(2.5×4),
=64÷10,
=6.4.