脫式計算。(能簡算的要簡算)0 8 3 5 5 5百分之80 0

2021-04-20 05:26:23 字數 2043 閱讀 3103

1樓:手機使用者

(1)3.5×0.8+7.5×0.8-80%,=(3.5+7.5-1)×0.8,

=10×0.8,

=8;(2)1 5

÷3+4 5

×1 3

,=(1 5

+4 5

)×1 3

,=1×1 3

,=1 3

;(3)20-(3.84+1.21)×0.4,=20-5.05×0.4,

=20-2.02,

=17.98;

(4)35÷[(11 6

-2 3

)×6].

=35÷[7 6

× 6],

=35÷7,=5.

-、脫式計算。(能簡便的簡便) (1)3.6×5÷3.6×5 二、解決問題。 (1)一間教室的面積 20

2樓:匿名使用者

(1)3.6×5÷3.6×5=25

87.04÷0.4²=544

9÷4.5=2小時 4.5÷9=0.5公頃18-21.6×18÷24.3=2

3.5×(0.32÷0.4)=2.8

(8.1+4.5)÷(7.52-1.5)=

3樓:匿名使用者

6.25÷1%-1.25×25×8

=625-(1.25×8)×25

=625-10×25

=625-250

=375

3/5×81+60%×19

=0.6×(81+19)

=0.6×100

=604/3×4÷4×4/3

=4/3×4/3×(4÷4)

=4/3×4/3

=16/9

13/7×12.5%+12.5%×13/6=(13/7+13/6)×12.5%

=1×12.5%

=0.125

5/4×3.5+5.5×80%+0.8

=0.8×(3.5+5.5+1)

=0.8×10

=8(27+19/18)÷9

=27÷9+19/18÷9

=3+19/2

=3又19/2

81/5×3.6÷1又6/1

=9/2÷7/6

=9/2×6/7

=27/7

4樓:建小之

25沒有長寬尺寸怎麼算

每公頃兩小時,每小時半公頃

脫式計算(能簡算的要用簡便方法計算): ①80÷(1-84%) ②5-5× 2 5 +

5樓:臥牛

①80÷(1-84%),

=80÷0.16,

=500;

②5-5×2 5

+3 5

,=5-2+3 5

,=33 5

;③0.25×32×12.5%,

=0.25×4×8×0.125,

=(0.25×4)×(8×0.125),

=1×1,

=1;④7 9

÷11 5

+2 9

×511

,=7 9

×511

+2 9

×511

,=(7 9

+2 9

)×511

,=1×5

11,=511.

6樓:冼棟屈嘉穎

解:①80÷(1-84%),

=80÷0.16,

=500;

②5-5×

25+35,

=5-2+35,

=335;

③0.25×32×12.5%,

=0.25×4×8×0.125,

=(0.25×4)×(8×0.125),

=1×1,

=1;④79÷115+29×511,

=79×511+29×511,

=(79+29)×511,

=1×511,

=511.

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