五年级脱式计算简便运算的题 脱式计算下面各题(能简算的要简算)①( 11 12 - 3 4 )÷( 2- 1 2
脱式计算下面各题(能简算的要简算)①( 11 12 - 3 4 )÷( 2- 1 2
脱式计算下面各题(能简算的要简算)①( 11 12 - 3 4 )÷( 2- 1 2
①( 11 12 - 3 4)÷( 2-
1 2),
=(
-
9 12)÷
3 2,
=
×
2 3,
=
;
②
+
1 2×3+
1 3×4+
1 4×5+
1 5×6+
1 7×8,
=(1-
)+(
1 2-
1 3)+(
1 3-
1 4)+(
1 4-
1 5)+(
1 5-
1 6)+(
1 7-
1 8),
=1 -
+
1 2-
1 3+
1 3-
1 4+
1 4-
1 5+
1 5-

1 6
+
1 7-
1 8,
=1-
+
1 7-
1 8,
=
+
1 56,
=
;
③(
-
4 21)÷
5 21,
=(
-
4 21)×
21 5,
=
×
21 5,
=
,
=2
;
④30.8÷[14-(9.85+1.07)],
=30.8÷(14-10.92),
=30.8÷3.08,
=10.
用脱式计算下面各题(能简算的要简算). ( 1 12 + 1 8 )×24 3 4
①( 1 12 + 1 8)×24,
=
×24+
1 8×24,
=2+3,
=5;
②
3 4×99+0.75,
=0.75×99+0.75,
=0.75×(99+1),
=0.75×100,
=75;
③2-
6 13÷
9 26-
2 3,
=2-1
-
2 3,
=2-(1
+
2 3),
=2-2,
=0;
④
5 8÷[
1 3+(
5 6-
3 4)],
=
÷[
1 3+
1 12],
=
÷
5 12,
=1.5.
计算下面各题,能简算的要简算.(1)772-317+128-283 (2)( 11 12 - 3 4 )÷
(1)772-317+128-283=772+128-(317+283)
=900-600
=300;
(2)( 11 12 - 3 4
)÷(2-
1 2)
=
÷
3 2=
1 6×
2 3=
1 9;
(3)(
+
1 6+
5 12)×36
=
×36+
1 6×36+
5 12×36
=9+6+15
=30;
(4)120÷[45×(1-
)]
=120÷[45×
]
=120÷5
=24.
计算下列各题,能简算的要简算.(1) 4 5 +( 3 8 - 1 4 )(2)2-
(1) 4 5 +( 3 8-
1 4),
=
+(
3 8-
2 8),
=
+
1 8,
=
+
5 40,
=
;
(2)2-
3 7-
4 7,
=2-(
+
4 7),
=2-1,
=1;
(3)
5 8-
1 3+
5 12,
=
-
8 24+
10 24,
=
+
10 24,
=
;
(4)38.7-7.84÷1.4,
=38.7-5.6,
=33.1;
(5)
5 12-(
1 12-
1 2),
=
-(
1 12-
6 12),
=
-(-
5 12),
=
+
5 12,
=
,
=
;
(6)8.8-2.5×1.8,
=8.8-4.5,
=4.3.
计算下面各题,能简算的要简算.(1)57- 3 11 - 8 11 (2)5.7×20%+ 1
(1)57- 3 11 - 8 11,
=57-(
+
8 11),
=57-1,
=56;
(2)5.7×20%+
1 5×
3 10,
=5.7×0.2+0.2×0.3,
=(5.7+0.3)×0.2,
=6×0.2,
=1.2;
(3)4.2÷[
7 8×(1-
1 7)],
=4.2÷[
×
6 7],
=4.2÷
,
=4.2×
,
=5.6.
计算下面各题,能简算的要简算. ①2- 2 7 - 5 7 ② 5 8 -(
①2- 2 7 - 5 7
,
=2-(
+
5 7),
=2-1,
=1;
②
5 8-(
5 8-
1 2),
=
-
5 8+
1 2,
=
;
③
4 3-
1 8+
7 12,
=
+
7 12,
=
;
④6-(
3 4-
2 5),
=6-
,
=5
.
脱式计算下面各题(能简算的要简算)(1)2.8+7.2×3.2(2)10.5÷(4.2÷2)×0.62(3)2.5×
(1)2.8+7.2×3.2
=2.8+23.04
=25.84
(2)10.5÷(4.2÷2)×0.62
=10.5÷2.1×0.62
=5×0.62
=3.1
(3)2.5×(4+0.4)
=2.5×4+2.5×0.4
=10+1
=11
(4)9.4×5.5+4.5×9.4
=9.4×(5.5+4.5)
=9.4×10
=94
计算下面各题,能简算的简算.① 5 12 ÷ 15 21 + 1 4 × 3 5
① 5 12 ÷ 15 21+
1 4×
3 5,
=
×
21 15+
1 4×
3 5,
=
+
3 20,
=
;
②58×102,
=58×(100+2),
=58×100+58×2,
=5800+116,
=5916;
③
9 18×[
3 16-(
7 16-
1 4)],
=
×[
3 16-
3 16],
=
×0.
=0;
④0.888×125×73+999×73,
=[(0.8+0.08+0.008)×125]×73+999×73,
=[0.8×125+0.08×125+0.008×125]×73+999×73,
=[100+10+1]×73+999×73,
=111×73+999×73,
=(111+999)×73,
=1110×73,
=81030.
计算下面各题(能简算的要简算).807×99+807 [1-( 1 2 - 1 4 )]× 2
(1)807×99+807,=807×(99+1),
=807×100,
=80700;(2)[1-( 1 2
-
1 4)]×
2 5,
=[1-
]×
2 5,
=
×
2 5,
=
;
(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.
=
× (
3 8+
5 8),
=
× 1,
=
.