計算下面各題(能簡便的用簡便方法)

2021-04-21 08:35:08 字數 3947 閱讀 2792

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

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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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