问题
解答题
|
答案
(1)4x-7×1.3=9.9,
4x-9.1=9.9,
4x-9.1+9.1=9.9+9.1,
4x÷4=19÷4,
x=4.75;
(2)1
:0.4=1.35:X,1 2
1
X=0.4×1.35,1 2
X×3 2
=0.54×2 3
,2 3
X=0.36;
(3)3-
×11 9
+1 2
,5 6
=3-
+1 6
,5 6
=3
;2 3
(4)0.9-(0.15+0.35÷
),5 7
=0.9-(0.15+0.49),
=0.9-0.64,
=0.26.
(5)7.25-3
+3.75-63 7
,4 7
=(7.25+3.75)-(3
+63 7
),4 7
=11-10,
=1;
(6)(2-
×3 4
)÷(4 5
+1 12
),4 15
=(2-
)÷3 5
,7 20
=
×7 5
,20 7
=4.