知识大全 计算下面各题(能简算的要简算)25×18×4 25×(40+7) 18×56+44×18 201×41 38×99+38 101×
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计算下面各题(能简算的要简算)25×18×4 25×(40+7) 18×56+44×18 201×41 38×99+38 101×
(1)25×18×4, =25×4×18, =100×18, =1800;(2)25×(40+7), =25×40+25×7, =1000+175, =1175; (3)18×56+44×18, (4)201×41, (5)38×99+38, (6)101×74-74, (7)425+21×(12+28), (8)15×[120-(42+36)], (9)(450÷18-13)×80, (10)600÷[2×(210-180)], |
计算下面各题,能简算的要简算: 56×(2÷58?3) [334?(172?4×158)]÷34 [9?(112+18)×24]÷85
(1)
5 |
6 |
×(2÷
5 |
8 |
-3),
=
5 |
6 |
×(2×
8 |
5 |
-3),
=
5 |
6 |
×2×
8 |
5 |
-
5 |
6 |
×3,
=
8 |
3 |
?
5 |
2 |
,
=
16 |
6 |
?
15 |
6 |
,
=
1 |
6 |
;
(2)[
33 |
4 |
?(
17 |
2 |
?4×
15 |
8 |
)]÷
3 |
4 |
,
=[
33 |
4 |
-(
17 |
2 |
-
15 |
2 |
]÷
3 |
4 |
,
=
29 |
4 |
×
4 |
3 |
,
=9
2 |
3 |
;
(3)[9-(
1 |
12 |
+
1 |
8 |
)×24]÷
8 |
5 |
,
=[9-(24×
1 |
12 |
+24×
1 |
8 |
)]×
5 |
8 |
,
=[9-5]×
5 |
8 |
,
=2.5.
计算下面各题,能简算的要简算.(125+7)×8 3200÷25×4 3.27+6.4+2.73+4.6 25×44 6.45-0.58-1.
(1)(125+7)×8,
=125×8+7×8,
=1000+56,
=1056;
(2)3200÷25×4,
=128×4,
=512;
(3)3.27+6.4+2.73+4.6,
=(3.27+2.73)+(6.4+4.6),
=6+11,
=17;
(4)25×44,
=25×4×11,
=100×11,
=1100;
(5)6.45-0.58-1.42,
=6.45-(0.58+1.42),
=6.45-2,
=4.45;
(6)12×(324-285)÷26,
=12×39÷26,
=468÷26,
=18.
计算下面各题(能简算的要简算).807×99+807 [1-(12-14)]×25 20.11×83+1.7×201.1 65×38+58
(1)807×99+807,
=807×(99+1),
=807×100,
=80700;
(2)[1-(
1 |
2 |
-
1 |
4 |
)]×
2 |
5 |
,
=[1-
1 |
4 |
]×
2 |
5 |
,
=
3 |
4 |
×
2 |
5 |
,
=
3 |
10 |
;
(3)20.11×83+1.7×201.1,
=20.11×83+17×20.11,
=20.11×(83+17),
=20.11×100,
=2011;
(4)
6 |
5 |
×
3 |
8 |
+
5 |
8 |
÷
5 |
6 |
.
=
6 |
5 |
×(
3 |
8 |
+
5 |
8 |
),
=
6 |
5 |
×1,
=
6 |
5 |
.
(能简便的要简算) 102×45 823-497 18×56+44×18 25×18×4 77×99+77
(1)102×45, =(100+2)×45, =100×45+2×45, =4500+90, =4590;(2)823-497, =823-(500-3), =823-500+3, =323+3, =326; (3)18×56+44×18, (4)25×18×4, (5)77×99+77, |
计算下面各题,能简算的要简算. ①2-27-57 ②58-(58-12) ③43-18+712 ④6-(34-25
①2-
2 |
7 |
-
5 |
7 |
,
=2-(
2 |
7 |
+
5 |
7 |
),
=2-1,
=1;
②
5 |
8 |
-(
5 |
8 |
-
1 |
2 |
),
=
5 |
8 |
-
5 |
8 |
+
1 |
2 |
,
=
1 |
2 |
;
③
4 |
3 |
-
1 |
8 |
+
7 |
12 |
,
=
29 |
24 |
+
7 |
12 |
,
=
43 |
24 |
;
④6-(
3 |
4 |
-
2 |
5 |
),
=6-
7 |
20 |
,
=5
13 |
20 |
.
计算下面各题,能简算的要简算. (125+7)×8 3.27+6.4+2.73+4.6 25×44 12×(324-285
(1)(125+7)×8, =125×8+7×8, =1000+56, =1056;(2)3.27+6.4+2.73+4.6, =(3.27+2.73)+(6.4+4.6), =6+11, =17; (3)25×44, (4)12×(324-285)÷26, |
计算下面各题,能简算的就简算.47×4.5-27×4.51.25×3.2×0.80.75×18÷0
①47×4.5-27×4.5
=(47-27)×4.5
=20×4.5
=90;
②1.25×3.2×0.8
=3.2×(1.25×0.8)
=3.2×1
=3.2;
③0.75×18÷0.25
=0.75÷0.25×18
=3×18
=54;
④9.07-22.78÷3.4
=9.07-6.7
=2.37.
计算下面各题(能简算的要简算)1.25×3.2×2.5 1.8×5.6+44×0.18 3.4×99+3.4 101×8.3-8.3 (27
(1)1.25×3.2×2.5,
=(1.25×0.8)×(4×2.5),
=1×10,
=10;
(2)1.8×5.6+44×0.18,
=1.8×(5.6+4.4),
=1.8×10,
=18;
(3)3.4×99+3.4,
=3.4×(99+1),
=3.4×100,
=340;
(4)101×8.3-8.3,
=(101-1)×8.3,
=100×8.3,
=830;
(5)(27÷1.8-11)×2.5,
=(15-11)×2.5,
=4×2.5,
=10;
(6)39.4×[0.96÷(5.4÷0.9)],
=39.4×[0.96÷6],
=39.4×0.16,
=6.304.
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