用递等式计算能简算的要简算 用递等式计算.(1)2632-450÷18×25(2)1.8÷0.75-0.48×0.5(3)( 7 8 + 3 4
用递等式计算.(1)2632-450÷18×25(2)1.8÷0.75-0.48×0.5(3)( 7 8 + 3 4
用递等式计算.(1)2632-450÷18×25(2)1.8÷0.75-0.48×0.5(3)( 7 8 + 3 4
(1)2632-450÷18×25,=2632-625,
=2007;(2)1.8÷0.75-0.48×0.5,
=2.4-0.24,
=2.16;
(3)(
7 8+
3 4)÷
13 11-
4 5,
=
×
11 13-
4 5,
=
-
4 5,
=
;
(4)
1 6÷[1÷(
14 15-
9 10)],
=
÷[1÷
1 30],
1 6÷30,
=
×
1 30,
=
.
递等式计算. 743-450÷18×25 88× 2 3 ×(1÷ 3 4 -1) 519.2÷(24.3
(1)743-450÷18×25,=743-25×25,
=743-625,
=118;(2)88× 2 3
×(1÷
3 4-1),
=88×
×(
4 3-1),
=88×
×
1 3,
=
×
1 3,
=19
;
(3)519.2÷(24.3×2-4.6),
=519.2÷(48.6-4.6),
=519.2÷44,
=11.8;
(4)126×98+126+63×2,
=126×98+126+126,
=126×(98+1+1),
=126×100,
=12600.
递等式计算. 743-450÷18×25 88×125 2 3 ×(1÷ 3 4 -1) 519.2÷(2
(1)743-450÷18×25,=743-25×25,
=743-625,
=118;(2)88×125,
=11×8×125,
=11×(8×125),
=11×1000,
=11000;
(3)
2 3×(1÷
3 4-1),
=
×(
4 3-1),
=
×
1 3,
=
;
(4)519.2÷(24.3×2-4.6),
=519.2÷(48.6-4.6),
=519.2÷44,
=11.8;
(5)126×98+126+63×2,
=126×98+126×1+126×1,
=126×(98+1+1),
=126×100,
=126.
用递等式计算.(1)1375+450÷18×25 (2)168.1÷(4.3×2-0.4) (3) 3 25 ÷ 1
(1)1375+450÷18×25,=1375+25×25,
=1375+625,
=2000;(2)168.1÷(4.3×2-0.4),
=168.1÷(8.6-0.4),
=168.1÷8.2,
=20.5;
(3)
3 25÷
1 10+
1 5,
=
×10+
1 5,
=
+
1 5,
=
;
(4)[1-(
1 2-
1 4)]×
2 3,
=[1-
+
1 4]×
2 3,
=
×
2 3,
=
.
用递等式计算.(90.78-52.78÷26)×41000-450÷18×25 3 4 ÷(5-2.8÷ 4 7 ) (3
(1)(90.78-52.78÷26)×4,
=(90.78-2.03)×4,
=88.75×4,
=355;(2)1000-450÷18×25,
=1000-25×25,
=1000-625,
=375;
(3)
3 4÷(5-2.8÷
4 7) ,
=
÷(5-4.9),
=
÷0.1,
=7.5;
(4)(3
3 4+2
1 6)÷(1.75×75%),
=5
÷
21 16,
=
.
用递等式计算(1)1379+450÷18×40(2)(3.2÷16+10.8)÷22(3) 5 11 × 7 25
(1)1379+450÷18×40,=1379+25×40,
=1379+1000,
=2379;(2)(3.2÷16+10.8)÷22,
=(0.2+10.8)÷22,
=11÷22,
=0.5;
(3)
5 11×
7 25+
7 25×
6 11,
=(
+
6 11)×
7 25,
=1×
,
=
;
(4)
1 4×
1 7÷(
5 6-
3 4),
=
×
1 7÷
1 12,
=
×
1 7×12,
=
×12×
1 7,
=3×
,
=
.
用递等式计算.(1)1357+450÷18×25(2)13.7-26.4÷(2.6+1.4)(3)3.6×[2÷( 4 5 -0.6
(1)1357+450÷18×25,=1357+25×25,
=1357+625,
=1982;(2)13.7-26.4÷(2.6+1.4),
=13.7-26.4÷4,
=13.7-6.6,
=7.1;
(3)3.6×[2÷(
4 5-0.6)],
=3.6×[2÷0.2],
=3.6×10,
=36;
(4)4-[1-(
3 5+
1 4)]÷
3 17,
=4-[1-
]÷
3 17,
=4-
÷
3 17,
=4-
,
=3
.
用递等式计算.(1)0.48+10.8÷0.36×0.5
(1)0.48+10.8÷0.36×0.54,
=0.48+30×0.54,
=0.48+16.2,
=16.68;
(2)[9.08-(0.61+1.75)]+3.2,
=[9.08-2.36]+3.2,
=6.72+3.2,
=9.92;
(3)
13 14-
15 28÷
5 8+
1 4,
=
-
15 28×
8 5+
1 4,
=

13 14
-
6 7+
1 4,
=
+
1 4,
=
;
(4)
4 5÷[(
3 4-
2 3)÷
5 8],
=
÷[
1 12÷
5 8],
=
÷[
1 12×
8 5],
=
÷
2 15,
=
×
15 2,
=6.