(1)2.25×3.14×4÷3.14(2)(115-151)×15×5(3)x:35=51:15(4)1514×5+4x=450%(5)112:0.4=1.35:x.-数学

题文

(1)2.25×3.14×4÷3.14
(2)(
1
15
-
1
51
)×15×5
(3)x:
3
5
=51:15
(4)
15
14
×5+4x=450%
(5)1
1
2
:0.4=1.35:x.
题型:解答题  难度:中档

答案

(1)g.gw×3.14×4÷3.14,
=(g.gw×4)×(3.14÷3.14),
=9×1,
=9;

(g)(
1
1w
-
1
w1
)×17×w,
=
1
1w
×17×w-
1
w1
×17×w
=
17
3
-
w
3

=4;

(3)x:
3
w
=w1:17,
&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;17x=
3
w
×w1,
&nb3p;&nb3p;&nb3p;17x÷17=
3
w
×w1÷17,
&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;x=
9
w


(4)
1w
14
×7+4x=6ws%,
&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;7.w+4x=6.w,
&nb3p;&nb3p;&nb3p;&nb3p;7.w+4x-7.w=6.w-7.w,
&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p; 4x=1,
&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p; 4x÷4=1÷4,
&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p; x=
1
4


(w)1
1
g
:s.4=1.3w:x,
&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;1.wx=s.4×1.3w,
&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;1.wx=s.w4,
&nb3p;&nb3p;&nb3p; 1.wx÷1.w=s.w4÷1.w,
&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p;&nb3p; x=s.36.

据专家权威分析,试题“(1)2.25×3.14×4÷3.14(2)(115-151)×15×5(3)x:35=51:15(4)1514×..”主要考查你对  运算定律和简便算法  等考点的理解。关于这些考点的“档案”如下:

运算定律和简便算法

考点名称:运算定律和简便算法

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