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问题 解答题
简便运算
(1)
3
5
×18-7×
3
5
-
3
5
(2)99×
97
98
（3）9.99×22.2+33.3×3.34(4)
1
3
+
1
15
+
1
35
+
1
63
+
1
99
+
1
143
．
答案

（1）

3
5
×18-7×
3
5
-
3
5
，

=

3
5
×（18-7-1），

=

3
5
×10，

=6；

（2）99×

97
98
，

=（98+1）×

97
98
，

=98×

97
98
+1×
97
98
，

=97+

97
98
，

=97

97
98
；

（3）9.99×22.2+33.3×3.34，

=19.98×11.1+11.1×10.02，

=（19.98+10.02）×11.1，

=30×11.1，

=333；

（4）

1
3
+
1
15
+
1
35
+
1
63
+
1
99
+
1
143
，

=[（1-

1
3
）+（
1
3
-
1
5
）+（
1
5
-
1
7
）+（
1
7
-
1
9
）+（
1
9
-
1
11
）+（
1
11
-
1
13
）]×
1
2
，

=[1-

1
13
]×
1
2
，

=

12
13
×
1
2
，

=

6
13
．

填空题


A How to Use a Painting Knife 使用画刀的方法
Painting with a knife is a bit like putting butter on bread and produces quite a (1) result to a brush. Painting knives are excellent for producing textured, impasto work and (2) areas of flat colour.
What’s the difference between a palette knife and a painting knife
A palette knife is a long, straight spatula that is used (3) mixing paints and scraping a palette clean. They’re made from metal, plastic, or wood and (4) either be completely straight or have a slightly bent handle. A painting knife has (5) large crank in the handle, which takes your hand away from the painting surface. They (6) in numerous shapes(for example pear-, diamond-, or trowel-shaped) and are used for painting (7) of a brush. The edge of the knife is blunt, so that it doesn’t cut the (8) .
·What shape of painting knife should I use
Different shaped painting knives produce different effects. For example, a short blade produces angular strokes (9)a long blade makes it easy to put down sweeps of colour.
·Why can’t I use a palette knife to paint with
You can. Painting (10) just have the advantage of coming in more angular shapes and with sharper points. And (11) larger crank in the handle means there’s less chance of rubbing your knuckles into wet (12) . If you’re unsure whether you’re going to enjoy painting with a knife, first buy a (13) , plastic palette knife and experiment a bit with this before upgrading to a wood-and-metal knife.
·How do I use painting knife
(14) the handle firmly so you’re got good control. Pick up some paint off your palette (15) the tip, as you’d pick up some butter with a knife. Use the side of the (16) to spread paint across your canvas, or press it onto the canvas, as you (17) spread butter across a slice of bread．It’ll seem strange at first as it’s quite (18) to using a brush. Using just the tip of the blade will produce small dots. (19) the edge of the knife down will produce fine lines. Pressing the blade flat down (20) the paint will produce ridges. Scrape back into the paint to reveal underlying layers (called sgraffito).

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某市政府机关工作人员于某，因涉嫌犯间谍罪而被有关部门立案侦查，继而被依法逮捕，下列说法正确的有：

A．本案应由公安机关立案侦查

B．本案应由人民检察院立案侦查

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D．对于某的逮捕应由公安机关执行
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