1樓:手機使用者
(1)31 6
÷(1+1 3
×13 4
),=31 6
÷(1+1 3
×7 4
),=31 6
÷(1+7
12),
=19 6
÷1912
,=19 6
×1219
,=2;
(2)(
1 15
+217
)×15×17,
=1 15
×15×17+2
17×15×17,
=17+30,
=47;
(3)(9.6-101 2
÷1.25)÷(11 3
×0.75),
=(9.6-21 2
÷5 4
)÷(4 3
×3 4
),=(9.6-21 2
×4 5
)÷1,
=(9.6-8.4)÷1,
=1.2;
(4)5.66×7.28-3.
16×3.16-3.16×4.
12,=5.66×7.28-3.
16×(3.16+4.12),=5.
66×7.28-3.16×7.
28,=(5.66-3.16)×7.
28,=2.5×7.28,
=18.2;
(5)2012×0.875+201.2×1.25,=2012×0.875+2012×0.125,=2012×(0.875+0.125),
=2012×1,
=2012;
(6)1
1×2+1
2×3+1
3×4+…+1
99×100
,=1-1 2
+1 2
-1 3
+1 3
-1 4
+…+1
99-1
100,
=1-1
100,
=99 100.
計算下面各題,能簡便的用簡便方法計算 5/9+3又1/6÷(3又1/4-1又2/3)×1又1/2
2樓:叫啥知不道
5/9+3又1/6÷(3又1/4-1又2/3)×1又1/2=5/9+19/6*12/19*3/2
=5/9+3
=3又5/9
3.5×1又1/4+1.25×27/10+3.8/(4/5)=1.25*(3.5+2.7+3.8)
=1.25*10
=12.5
3.2/【(2又3/4-19/36)/(1/5+30%)』】=3.2/(40/9)
=0.72
數學1.計算題,能簡便的要簡便計算。1/3÷5/6÷16/15 【1-(1/5+1/6)】÷1/12 ( 5/6-3/4)÷(1/4-1/8)
3樓:書語蝶暴磬
1、計算題:
解:1/3÷5/6÷16/15
=1/3×6/5×15/16=3/8
[1-(1/5+1/6)]÷1/12 =[1-11/30]×12=19/30×12=38/5
(5/6-3/4)÷(1/4-1/8)=1/12÷1/8=1/12×8=2/3
應用題:
解:30÷5/6×8/9=36×8/9=32(千克)答:丙筐梨的質量是32千克.
計算下面各題,能簡便計算的用簡便方法計算 2-6/13÷9/26 (1/3+1/4)×36 6/7×(4/5-2/3)÷1/5
4樓:數學新綠洲
2-6/13÷9/26
= 2- (6/13)×(26/9)
=2- 4/3
=2/3
.(1/3+1/4)×36
=(1/3)×36 +(1/4)×36
=12+9
=21.
6/7×(4/5-2/3)÷1/5
=(6/7)×(4/5 - 2/3)×5
=(6/7)×(4 - 10/3)
=(6/7)×(2/3)
=4/7
.3/4-3/4×4/7+9/7
=(3/4)×(1- 4/7)+
9/7=(3/4)×(3/7)+9/7
=(1/4)×(9/7)+ 9/7
=(1/4 +1)×(9/7)
=(5/4)×(9/7)
=45/28
=1又17/28
數學1.計算題,能簡便的要簡便計算。1/3÷5/6÷16/15 【1-(1/5+1/6)】÷1/12 ( 5/6-3/4)÷(1/4-1/8)
5樓:牢廷謙籍念
1、計算題:
解:1/3÷5/6÷16/15
=1/3×6/5×15/16=3/8
[1-(1/5+1/6)]÷1/12 =[1-11/30]×12=19/30×12=38/5
(5/6-3/4)÷(1/4-1/8)=1/12÷1/8=1/12×8=2/3
應用題:
解:30÷5/6×8/9=36×8/9=32(千克)答:丙筐梨的質量是32千克.
計算下面各題,能簡便的要用簡便方法計算. 1.3+0.94+0.06+7.7 6.27÷0.3+3 12.5×0.48
6樓:你大爺
(1)1.3+0.94+0.06+7.7,=(1.3+7.7)+(0.94+0.06),=9+1,
=10;
(2)6.27÷0.3+3,
=20.9+3,
=23.9;
(3)12.5×0.48×0.8,
=(12.5×0.8)×0.48,
=10×0.48,
=4.8;
(4)5.2×[(1.3+2.1)÷0.2],=5.2×[3.4÷0.2],
=5.2×17,
=88.4.
計算下面各題,能簡便的要簡便計算3 72
1 3.72 5.3 7.28 3.7,3.72 7.28 5.3 3.7 11 9,20 2 7000 125 8,7000 125 8 7000 1000,7 3 1600 600 75 25,1600 8 25,1592 25,1617 4 35 125 16,35 2 125 8 70 10...
計算下列各題(脫式計算)簡便計算
98 265 202 273 73 27 98 202 265 273 73 27 300 265 273 100 565 173 250 13 4 3200 4 25 250 4 13 3200 4 25 1000 13 3200 100 13000 32 88 125 99 38 38 11 8...
計算下面各題,能簡便計算的用簡便方法計算
1 4.82 5.2 0.8 0.6,4.82 6.5 0.6,4.82 3.9,0.92 2 1 2 34 3 5 710,12 320 710,7 20 710,12 3 79 5 11 29 5 11,79 29 511 1 511,511 4 12.3 99,12.3 100 1 12.3 ...