问题
解答题
|
答案
(1)7.26-2.38+12.74-7.62,
=(7.26+12.74)-(2.38+7.62),
=20-10,
=10;
(2)67÷
÷12.5,4 5
=67÷(
×12.5),4 5
=67÷10,
=6.7;
(3)
×7 13
+9 17
×9 17
,6 13
=(
+7 13
)×6 13
,9 17
=1×
,9 17
=
;9 17
(4)87×
,87 88
=(88-1)×
,87 88
=88×
-87 88
,87 88
=87-
,87 88
=86
;1 88
(5)51×3.2+32×4.9,
=51×3.2+3.2×49,
=(51+49)×3.2,
=100×3.2,
=320.