计算下列各题.(能简算的要简算)3.2×25×12.5= 416-1.65-1.35= 1112×34+1112×214= [35+9.6÷(
计算下列各题.(能简算的要简算)3.2×25×12.5=416-1.65-1.35=1112×34+1112×214=[35+9.6÷(5?145)]×213=3.85×...
计算下列各题.(能简算的要简算)3.2×25×12.5= 416-1.65-1.35= 1112×34+1112×214= [35+9.6÷(5?145)]×213= 3.85×214+0.15÷49=
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(1)3.2×25×12.5,
=0.8×4×25×12.5,
=(0.8×12.5)×(4×25),
=10×100,
=1000;
(2)4
-1.65-1.35,
=4
-(1.65+1.35),
=4
-3,
=1
;
(3)
×
+
×2
,
=
×(
+2
),
=
×3,
=
;
(4)[
+9.6÷(5?1
)]×2
,
=[
+9.6÷
]×2
,
=[
+9.6×
]×2
,
=[0.6+3]×2
,
=3.6×
,
=8.4;
(5)3.85×2
+0.15÷
,
=3.85×
+0.15×
,
=(3.85+0.15)×
,
=4×
=0.8×4×25×12.5,
=(0.8×12.5)×(4×25),
=10×100,
=1000;
(2)4
1 |
6 |
=4
1 |
6 |
=4
1 |
6 |
=1
1 |
6 |
(3)
11 |
12 |
3 |
4 |
11 |
12 |
1 |
4 |
=
11 |
12 |
3 |
4 |
1 |
4 |
=
11 |
12 |
=
11 |
4 |
(4)[
3 |
5 |
4 |
5 |
1 |
3 |
=[
3 |
5 |
16 |
5 |
1 |
3 |
=[
3 |
5 |
5 |
16 |
1 |
3 |
=[0.6+3]×2
1 |
3 |
=3.6×
7 |
3 |
=8.4;
(5)3.85×2
1 |
4 |
4 |
9 |
=3.85×
9 |
4 |
9 |
4 |
=(3.85+0.15)×
9 |
4 |
=4×
9 |
4
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