问题
解答题
|
答案
(1)(
-4 7
+4 21
)×42,1 3
=
×42-4 7
×42+4 21
×42,1 3
=24-8+12,
=16+12,
=28;
(2)0.42×1
+33 7
,1 8
=0.6+3
,1 8
=3.725;
(3)1
÷3.6×7 12
,6 19
=1
×7 12
×5 18
,6 19
=
;5 36
(4)15
×7+31 3
÷2 3
,1 7
=15
×7+31 3
×7,2 3
=(15
+31 3
)×7,2 3
=19×7,
=133;
(5)3
-2 13
×3.6,1 4
=3
-0.9,2 13
=
;293 130
(6)
×13 4
÷31 9
,2 5
=
×3 4
×10 9
,5 17
=
.25 102