1樓:新野旁觀者
1/5+7/15+4/15
=3/15+7/15+4/15
=14/15
7/10-(3/4-2/5)
=7/10-3/4+2/5
=14/20-15/20+8/20
=7/20
1-7/15-2/5
=1-(7/15+6/15 )
=1-13/15
=2/15
13/15-(1/3+2/5)
=13/15-5/15-6/15
=2/15
5-3/7+4/7
=5-1/7
=4又6/7
23/24-1/6-3/8
=23/24-4/24-9/24
=5/12
4/9+1/10+5/9
=4/9+5/9+1/10
=1+1/10
=1.1
1/12+3/8+11/12+5/8
=(1/12+11/12)+(3/8+5/8)=1+1
=21-(3/11-5/9)
=1-27/99+55/99
=1+28/99
=1又28/99
請在4天內發給我!!!
2樓:匿名使用者
1-3/10-2/5=1-3/10-4/10(通分)=3/10
5-3/7+4/7=5+1/7=5又1/7(帶分數)=36/7(假分數)
23/24-1/6-3/8=23/24-4/24(通分)-9/24(通分)=12/24=1/2
4/9+1/10+5/9=(4/9+5/9)+1/10=1+1/10=11/10(假分數)
1/12+3/8+11/12+5/8=(1/12+11/12 )+(3/8+5/8)=1+1=2
1-(3/11-5/9)=1-(27/99-55/99)=99/99-27/99+55/99=127/99
3樓:匿名使用者
你說的女孩房間時都會發生地方還是大家發揮
計算下面各題.(能簡便的用簡便方法計算) 6 5 × 2 15 + 2 15
4樓:馴魚
(1)6 5
×215
+215 ÷4
5,=6 5
×215
+215
×5 4
,=215
×(6 5
+5 4
),=2 15
×4920
,=49
150;
(2)8 3
×(1 3
-821
×816
),=8 3
×(1 3
-421
),=8 3
×1 7
,=821
;(3)9
10×11-9
10,=9
10×(11-1),
=9 10
×10,=9.
計算下面各題(能簡便的用簡便方法) 8/9+7/12+3/4 5/12+7/8-9/20 2.85+2/7+2.15+4/7 3.4-(0.25+2/5)
5樓:新野旁觀者
8/9+7/12+3/4
=32/36+21/36+27/36
=80/36
=20/9
=2又2/9
5/12+7/8-9/20
=50/120+105/120-54/120=101/120
2.85+2/7+2.15+4/7
=(2.85+2.15)+2/7+4/7
=5+6/7
=5又6/7
3.4-(0.25+2/5)
=3.4-0.4-0.25
=3-0.25
=2.75
7/8-7/27-20/27
=7/8-(7/27+20/27)
=7/8-1
=-1/8
2.15-(5/6-1/12)
=2.15-3/4
=2.15-0.75
=1.4
11/12+5/8+3/8+1/12
=(11/12+1/12)+(5/8+3/8)=1+1
=25-3/7-4/7
=5-(3/7+4/7)
=5-1
=42/5*20+3/5*20
=(2+3)/5*20
=5/5*20
=205/6-1/4+1/3
=10/12-3/12+4/12
=11/12
6樓:匿名使用者
我是無奈下發的:我是一個叫冰楓的男孩,前
計算下面各題,能簡便的要用簡便方法計算。15點7-括號5點7一2點8、9分之4一16分之7乘以9分
7樓:寒夜之繆斯
15.7 - ( 5.7 - 2.8 ) = 15.7 - 5.7 + 2.8 = 12.8
4/9 - 7/16 * 4/9 = 4/9 * 1 - 7/16 * 4/9 = 4/9 * (1 - 7/16) = 4/9 * 9/16 = 1/4
(3/4 - 5/7 )/ (1/56) =( 3/4 / 1/56 ) - ( 5/7 /1/56 ) = 42 - 40 = 2望採納
計算下面各題(能簡便的用簡便方法計算).10.15-10.75×0.4-5.75.8×(3.87-0.13)+4.2×3.7432.52-(6+
8樓:慄鎖
(bai1)10.15-10.75×
du0.4-5.7,
zhi=10.15-4.3-5.7,
=10.15-(dao4.3+5.7),
=10.15-10,
=0.15;
(2)5.8×(3.87-0.13)+4.2×3.74,=5.8×3.74+4.2×3.74,
=(5.8+4.2)×專3.74,
=10×3.74,
=37.4;
(3)32.52-(6+9.728)÷屬3.2×2.5,=32.52-15.728÷3.2×2.5,=32.52-4.915×2.5,
=32.52-12.2875,
=20.2325;
(4)[(7.1-5.6)×0.9-1.15]÷2.5,=[1.5×0.9-1.15]÷2.5,
=[1.35-1.15]÷2.5,
=0.2÷2.5,
=0.08;
(5)5.4÷[2.6×(3.7-2.9)+0.62],=5.4÷[2.6×0.8+0.62],
=5.4÷[2.08+0.62],
=5.4÷2.7,
=2;(6)[20-(90.75÷6.6+2.25)]×11.6,=[20-(13.75+2.25)]×11.6,=[20-16]×11.6,
=4×11.6,
=46.4.
計算下面各題,注意使用簡便方法 (3/4-2/3)÷1/5 (3/8+7/12)×8+1/
9樓:匿名使用者
(3/4-2/3)÷1/5
=(9/12-8/12)x5
=1/12x5
=5/12
(3/8-7/12)x8+1/17
=3/8x8-7/12x8+1/17
=3-14/3+1/17
=5/3+1/17
=88/51
4/5x7/8+7/8÷5
=4/5x7/8+7/8x1/5
=(4/5+1/5)x7/8
=1x7/8
=7/8
(1-8/15x3/4)÷3/5
=(1一2/5)x5/3
=3/5x5/3=1
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