五年级脱式计算简便运算的题 脱式计算下列各题,能简算的要简算(1)71+64÷16;(2)8.6×3-4.2;(3)57×(1-35);(4)917×18+1
脱式计算下列各题,能简算的要简算(1)71+64÷16;(2)8.6×3-4.2;(3)57×(1-35);(4)917×18+1
脱式计算下列各题,能简算的要简算(1)71+64÷16;(2)8.6×3-4.2;(3)57×(1-35);(4)917×18+1
(1)71+64÷16
=71+4
=75
(2)8.6×3-4.2
=25.8-4.2
=21.6
(3)
5 7×(1-
3 5)
=
×
2 5=
2 7(4)
9 17×18+16×
9 17=(18+16)×
9 17=34×
9 17=18
(5)
2 3÷[(
1 2+
1 3)×
2 5]
=
÷[
5 6×
2 5]
=
÷
1 3=2
计算下列各题.(能简算的要简算)(1)0.25×18+34×18 (2)...
(1)0.25×
1 8+
3 4×
1 8=(0.25+0.75)×
1 8=1×
1 8=
1 8(2)
3 4×20%+0.75×0.4
=0.75×(0.2+0.4)
=0.75×0.6
=0.45
(3)[1-(
1 2-
1 4)]×
2 3=[1-
1 4]×
2 3=
3 4×
2 3=
1 2(4)3÷
7 4-2×
4 7=3×
4 7-2×
4 7=(3-2)×
4 7=1×
4 7=
4 7计算下列各题,能简算的要简算.(1)3.2×0.25×1.25(2)8.23×8.6+1.4×8.23(
(1)3.2×0.25×1.25
=4×0.8×0.25×1.25
=(4×0.25)×(1.25×0.8)
=1×1
=1;
(2)8.23×8.6+1.4×8.23
=8.23×(8.6+1.4)
=8.23×10
=82.3;
(3)3.5÷(2-1.3)×4.5
=3.5÷0.7×4.5
=5×4.5
=22.5.
计算下列各题,能简算的要简算. (1- 14 15 )× 4 9 ÷ 5 18
(1)(1- 14 15 )× 4 9÷
5 18,
=
×
4 9÷
5 18,
=
×
4 9×
18 5=
1 15×(
4 9×
18 5),
=
×
8 5,
=
;
(2)30×(
1 15+
4 5+
1 3),
=30×
+30×
4 5+30×
1 3,
=2+24+10,
=36;
(3)
1 4×
3 5+
2 5÷4,
=
×
3 5+
2 5×
1 4,
=
×(
3 5+
2 5),
=
×1,
=
;
(4)
3 16÷0.375×
4 5,
=
×
8 3×
4 5,
=
×
4 5,
=
.
计算下列各题,能简算的要简算(1)37.68-5.72-78.63-4.28(2)112×(24-4 4 5 )÷24(3)1
(1)37.68-5.72-78.63-4.28,=(37.68-78.63)-(5.72+4.28),
=-40.95-10,
=-50.95;(2)112×(24-4 4 5
)÷24,
=112×19.2÷24,
=2150.4÷24,
=89.6;
(3)1993÷1993
1993 1995.
=1993÷(1993+
),
=1993÷[1993×(1+
)],
=1993÷[1993×
],
=1993÷1993÷
,
=1÷
,
=
;
(4)1÷(2÷3)÷(3÷4)÷(4÷5)÷…÷(1999÷2000),
=1÷
÷
3 4÷
4 5÷…÷
1998 1999÷
1999 2000,
=1÷(
×
3 4×
4 5×…×
1998 1999×
1999 2000),
=1÷
,
=1000.
计算下列各题.(能简算的要简算)(1)7.8× 1 5 +2.2×20% ...
(1)7.8× 1 5 +2.2×20%,=7.8×0.2+2.2×0.2,
=(7.8+2.2)×0.2,
=10×0.2,
=2;
(2)0.5×[5

1 5
÷﹙
7 8-
1 16﹚],
=0.5×[
÷
13 16],
=0.5×[
×
16 13],
=0.5×
,
=3.2;
(3)(198+32×72)-2472÷24,
=(198+2304)-103,
=[(200-2)+(2300+4)]-103,
=[200+2300+(4-2)]-103,
=2500+2-(100+3),
=2500-100-(3-2),
=2400-1,
=2399;
(4)4
2 5×[2.6+
3 4-(0.65+1
3 4)]÷2
3 4,
=4
×[2.6+
3 4-0.65-1
3 4]÷2
3 4,
=4
×[2.6-0.65-(1
3 4-
3 4)]×
4 11,
=
×[1.95-1]×
4 11,
=
×0.95×
4 11,
=1.52.
计算下列各题,能简算的要简算.(1)79÷115+29×511 (2)(16+19-112)×4×9 (3)(8.5-4)×10.3
(1)
7 9÷
11 5+
2 9×
5 11,
=(
+
2 9)×
5 11,
=
;
(2)(
1 6+
1 9-
1 12)×4×9,
=
×36+
1 9×36?
1 12×36,
=6+4-3
=7;
(3)(8.5-4)×10.32÷4,
=4.5×10.32÷4,
=46.44÷4,
=11.61,
(4)5÷
1 4×[(1-
1 4)×1.2],
=5÷
×[
3 4×1.2],
=5÷
×
9 10,
=18,
(5)1.3-3.79+9.7-6.21,
=(1.3+9.7)-(3.79+6.21),
=11-10,
=1,
(6)3.2×12.5×2.5,
=(12.5×8)×(2.5×0.4),
=100×1,
=100.
计算下列各题,能简算的要简算.(1)19.2÷2.4×3.2(2)9.6×10.1(3)14.3÷1.1-
(1)19.2÷2.4×3.2
=8×3.2
=25.6;
(2)9.6×10.1
=9.6×10+9.6×0.1
=96+0.96
=96.96;
(3)14.3÷1.1-0.8
=13-0.8
=12.2;
(4)3.2×2.4+32×0.76
=3.2×2.4+3.2×7.6
=3.2×(2.4+7.6)
=3.2×10
=32.
计算下列各题,能简算的要简算:①5.39+27+4.61+57②15.83-27-57③34-1
①5.39+
2 7+4.61+
5 7=(5.39+4.61)+(
2 7+
5 7)
=10+1
=11
②15.83-
2 7-
5 7=15.83-(
2 7+
5 7)
=15.83-1
=14.83
③
3 4-
1 6-
5 12=
9 12-
2 12-
5 12=
1 6④1
7 9+3
5 8-
7 9=1
7 9-
7 9+3
5 8=1+3
5 8=4
5 8