五年级脱式计算简便运算的题 计算下列各题,能简算要简算(脱式计算)
计算下列各题,能简算要简算(脱式计算)
脱式计算下列各题.(能简算的要简算)
8.72*45.8/8.72/45.8*8.72 =8.72*45.8/45.8*8.72/8.72=8.72
1.1/[(20+9.744/2.4)*0.5-1.03]=1.1/[(20+4.06)*0.5-1.03]=1.1/(12.03-1.03)=1.1/11=0.1
[19+1.9*(3.8-0.38*0.5/0.05)]/0.38 =[19+1.9*(3.8-3.8)]/0.38=19/0.38=50
[27*4.5+8/0.6]-[120-(40*0.25+25/0.5)*2]*1999=[121.5+40/3]-[120-(10+50)*2]*1999=[121.5+40/3]-0=134.83(约等于)
计算下列各题,能简算的要简算
3/8×10/11+5/8÷11/10
=3/8×10/11+5/8×10/11
=(3/8+5/8)×10/11
=1×10/11
=10/11
48×(11/24-5/12+3/8)
=48×11/24-48×5/12+48×3/8
=22-20+18
=20
2.4-2.4×4/7-3/7
=2.4×(1-4/7)-3/7
=2.4×3/7-3/7
=(2.4-1)×3/7
=1.4×2/7
=0.4
3×(2/15+1/12)-2/5
=3×2/15+3×1/12-2/5
=2/5-2/5+3/4
=3/4
计算下列各题。(能简算的简算)
(7/12+3/8-5/6)/(1/24)=(7*2+3*3-5*4)/24*24=3
(4/9*3/5)/4+3/10=(1/9*3/5)+3/10=1/15+3/10=(2+3*3)/30=11/30
计算下列各题(能简算的要简算)(118?154)÷ 154 &...
(1)(
1 18?
1 54)÷
1 54,
=(
?
1 54)×54,
=
×54?
1 54×54,
=3-1,
=2,
(2)
× 43+
7 8×36+
7 8,
=
×(43+36+1),
=

7 8
×80,
=70,
(3))
×(
3 4÷
1 10),
=
×(
3 4×10),
=
×
15 2,
=4
,
(4))
÷[
1 25×(
2 5+
1 10)],
=
÷(
1 25×
1 2),
=
÷
1 50,
=26
.
脱式计算下列各题,能简算的要简算.(1)2220÷37-23 (2)7....
(1)2220÷37-23
=60-23
=37;
(2)7.2×4.5+2.8
=32.4+2.8
=35.2;
(3)
5 16×30+
5 16×2
=
×(30+2)
=
×32
=10;
(4)
÷[
5 6×(
4 5-
2 3)]
=
÷[
5 6×
2 15]
=
×9
=2;
(5)17.2-4x=5.2
17.2-4x+4x-5.2=5.2+4x-5.2
4x=12
4x÷4=12÷4
x=3.
计算下列各题 能简算的要简便计算
五分之三÷十五分之六=3/5×15/6=3/2
三分之二÷2+三分之一×二分之一=1/2×(2/3+1/3)=1/2
七分之一+八分之七×七分之五+八分之三=1/7+5/8+3/8=1/7+1=8/7
九分之四÷十二分之五=4/9×12/5=16/15
九分之八÷五分之一÷五分之四=8/9×5×5/4=50/9
【三分之一+六分之五】÷十二分之一=[1/3+5/6]×12=1/3×12+5/6×12=4+10=14
计算下列各题,能简算的要简算.89×386 &n...
(1)89×
3 86=(86+3)×
3 86,
=86×
+3×
3 86,
=3+
,
=3
;
(2)
7 13÷4+
6 13×
1 4=
7 13×
1 4++
6 13×
1 4,
=(
+
6 13)×
1 4,
=1×
,
=
;
(3)
1 20+0.24×6.4÷0.32
=0.05+0.24×(6.4÷0.32),
=0.05+0.24×20,
=0.05+4.8,
=4.85;
(4)6-
7 8×
8 21-
1 3=6-
1 3-
1 3,
=5
.