1樓:匿名使用者
(1)1840-725÷25×16,
=1840-29×16,
=1840-(30-1)×16,
=1840-30×16+16,
=1360+16,
=1376;
(2)278?8
17?917,
=278
?(817
+917
),=27
8?1,
=198
,=238;
(3)16.4+3.5+83.6+166.5,=(16.4+83.6)+(3.5+166.5),=100+170,
=270;
(4)(89+4
3)×34-1
4,=89
×34+43
×34-14
,=23+1-14,
=23-14
+1,=5
12+1,
=1512
;(5)59+59×13+14×41,
=(1+13)×59+14×41,
=14×59+14×41,
=(59+41)×14,
=100×14,
=1400;
(6)36÷[(56-1
3)×3],
=36÷[5
6×3-1
3×3],
=36÷32,
=36×23,
=24.
脫式計算(能簡算的要簡算)(12.5+7.5)÷0.25310-10×46.18÷6+
2樓:欲貓人
(1)(12.5+7.5)÷0.25
=20÷0.25
=80(2)310-10×4
=310-40
=270
(3)6.18÷6+4
=1.03+4
=5.03
(4)2÷8
5×25
4=2×5
8×25
4=125
16(5)13.1×56+5.6×69
=131×5.6+5.6×69
=(131+69)×5.6
=200×5.6
=1120
(6)2÷23-2
3÷2=2×32-2
3×12=3-1
3=223
脫式計算(能簡算的要簡算
3樓:軒胤
(1)6.72-2.3÷0.5×0.8
=6.72-4.6×0.8
=6.72-3.68
=3.04;
(2)98-1
7+18-6
7=(98+1
8)-(17+6
7)=54
-1=14;
(3)9
10÷[1
2×(65-3
10)]
=910
÷[12
×910]=9
10÷9
20=2;
(4)(27+1
5)×7×5=27
×7×5+1
5×7×5
=10+7
=17.
計算下面各題,能簡算的要簡算。(脫式計算) (6/35+4/21)÷4/7 2/ 50
4樓:匿名使用者
(6/35+4/21)÷4/7
=6/35×7/4+4/21×7/4
=3/10+1/3
=9/30+10/30
=19/30
2/9÷2/7÷14/15
=2/9×7/2×15/14
=14/18×15/14
=5/6
(5/6-3/4)÷5/12+4/5
=5/6×12/5-3/4×12/5+4/5=2-9/5+4/5
=2-13/5
=-3/5
3/10÷(4/5-1/2)
=3/10×5/4-3/10×2
=3/8-3/5
=15/40-24/40
=-9/40
2/25÷3/7+23/25÷3/7
=(2/25+23/25)÷3/7
=1×7/3
=2又1/3
8/9÷5/6+1/6
=8/9×6/5+1/6
=16/15+1/6
=32/30+5/30
=37/30
=1又7/30
2/3x=16
x=16×3/2
x=24
3/4x+1/4=3/8
3/4x=3/8-1/4
3/4x=1/8
x=1/8×4/3
x=1/6
1/5x-1/2=3/10
1/5x=1/2+3/10
1/5x=8/10
x=8/10×5x=4
5樓:**防騙
6/35x7/4十4/2lx7/4=3/10十1/3=9/30十10/30=19/30
2/9x7/2x1/14=1/185/6
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