知识大全 计算,能简算的用简便方法计算.375+450÷18×20 &.
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计算,能简算的用简便方法计算.375+450÷18×20 &..., 计算,能简算的用简便方法计算.375+450÷18×20 9.47+0.58-2.47 7 10 ×8.4+1.6×0.7
(1)375+450÷18×20,
=375+25×20,
=375+500,
=875;
(2)9.47+0.58-2.47,
=9.47-2.47+0.58,
=7+0.58,
=7.58;
(3)
7 |
10 |
×8.4+1.6×0.7,
=0.7×(8.4+1.6),
=0.7×10,
=7;
(4)
2 |
9 |
÷[
8 |
21 |
×(
1 |
3 |
+
5 |
12 |
)],
=
2 |
9 |
÷[
8 |
21 |
×
3 |
4 |
],
=
2 |
9 |
÷
2 |
7 |
,
=
7 |
9 |
.
计算下面各题,能简便计算的用简便方法计算.375+450÷18×25 &...
(1)375+450÷18×25,
=375+25×25,
=375+625,
=1000;
(2)
19 |
5 |
×
1 |
9 |
+
1 |
5 |
÷9,
=
19 |
5 |
×
1 |
9 |
+
1 |
5 |
×
1 |
9 |
,
=(
19 |
5 |
+
1 |
5 |
)×
1 |
9 |
,
=4×
1 |
9 |
,
=
4 |
9 |
;
(3)
3 |
10 |
÷(
5 |
2 |
-
5 |
3 |
)×
5 |
6 |
,
=
3 |
10 |
÷
5 |
6 |
×
5 |
6 |
,
=
3 |
10 |
×(
6 |
5 |
×
5 |
6 |
),
=
3 |
10 |
×1,
=
3 |
10 |
;
(4)13×(
1 |
26 |
+
2 |
11 |
)×22,
=(13×22)×(
1 |
26 |
+
2 |
11 |
),
=(13×22)×
1 |
26 |
+(13×22)×
2 |
11 |
,
计算,能简算的要简算(1)375+450÷18×25 &nb...
(1)375+450÷18×25,
=375+25×25,
=375+625,
=1000.
(2)4.38×5.6+56.2×0.56,
=4.38×5.6+5.62×5.6,
=(4.38+5.62)×5.6,
=10×5.6,
=56;
(3)
11 |
10 |
-
1 |
4 |
-
3 |
4 |
+
9 |
10 |
,
=(
11 |
10 |
+
9 |
10 |
)-(
1 |
4 |
+
3 |
4 |
),
=2-1,
=1;
(4)
4 |
15 |
÷(
13 |
9 |
-
2 |
3 |
×
5 |
6 |
),
=
4 |
15 |
÷(
13 |
9 |
-
5 |
9 |
),
=
4 |
15 |
÷
8 |
9 |
,
=
3 |
10 |
.
计算,能简算的用简便方法计算.125×8.08 ...
125×8.08,
=125×8+125×0.08,
=1000+10,
=1010,
86×15-380,
=1290-380,
=910,
79×25+20×79+79×55,
=79×(25+20+55),
=79×100,
=7900,
3 |
7 |
×(
4 |
5 |
-
2 |
3 |
)
=
3 |
7 |
×(
12 |
15 |
-
10 |
15 |
),
=
3 |
7 |
×
2 |
15 |
,
=
2 |
35 |
,
7 |
13 |
×
8 |
5 |
÷
14 |
39 |
,
=
7 |
13 |
×
8 |
5 |
×
39 |
14 |
,
=
12 |
5 |
,
[
3 |
5 |
-(
3 |
4 |
-
2 |
5 |
)]÷4,
=[
3 |
5 |
+
2 |
5 |
-
3 |
4 |
]÷4.
=
1 |
4 |
×
1 |
4 |
,
=
1 |
16 |
.
375+450÷18×25 简便计算
375+450÷18×25
=375+25×18÷18×25
=375+25×25
=375+625
=1000
脱式计算,能简算的要简算. 1.69÷1.3+2.5×0.4 375+450
(1)1.69÷1.3+2.5×0.4,
=1.3+1,
=2.3;
(2)375+450÷18×25,
=375+25×25,
=375+625,
=1000;
(3)2×1.4+2×1.6,
=2×(1.4+1.6),
=2×3,
=6;
(4)83×102-83×2,
=83×(102-2),
=83×100,
=8300.
计算,能简算的用简便方法计算.3-(12.9-84×17) ...
3-(12.9-84×
1 |
7 |
),
=3-(12.9-12),
=3-0.9,
=2.1;
44.4×25,
=11.1×4×25,
=11.1×(4×25),
=11.1×100,
=1100;
40 |
13 |
×(26×
3 |
40 |
),
=
40 |
13 |
×
3 |
40 |
×26,
=6;
2-[
1 |
6 |
+(
3 |
4 |
-
7 |
10 |
)],
=2-[
1 |
6 |
+
1 |
20 |
],
=2-
13 |
60 |
,
=1
47 |
60 |
.
计算下面各题,能简算的用简便方法计算
1、12/7-3/5-5/7=1-3/5=2/5;
2、(5/6+2/4-1/2)x24/2=(5/6+1/2-1/2)x12=5/6x12=10;
3、3/8÷(36+2/6)x10/3=3/8÷5/6x10/3=3/8x6/5x10/3=3/2=1又1/2;
4、9/8x(15+1)=9/8x16=18;
5、5/6x18+5/6x3/25+9/10=15+1/10+9/10=15+10/10=15+1=16;
6、15x2/5+15x2/3=6+10=16.
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