用簡便方法計算下面各題。要用脫式計算

時間 2021-08-30 10:00:11

1樓:匿名使用者

144又25分之12÷12

=(144+12/25)×1/12

=144×1/12+12/25×1/12

=12+1/25

=12又1/25

(9又7分之2+7又9分之2)÷(7分之5+9分之5)=(9+2/7+7+2/9)÷(5/7+5/9)=[16+2×(1/7+1/9)]÷[5×(1/7+1/9)]=[16+2×16/63]÷[5×16/63]=16÷(5×16/63) +(2×16/63)÷(5×16/63)

=63/5+2/5

=65/5=13

2樓:星空夜雨落

佔給位置先

(144又12/25)/12

=(144+12/25)/12

=144/12+12/25/12

=12+1/25

=12又1/25

(9又2/7+7又2/9)/(5/7+5/9)=(9+2/7+7+2/9)/(5/7+5/9)=[16+2×(1/7+1/9)]/[5×(1/7+1/9)]=16/5/(1/7+1/9)+2/5

=16/5x63/16+2/5

=63/5+2/5

=65/5=13

3樓:匿名使用者

144又25分之12÷12 =(144+12/25)÷12 =144÷12 +(12/25)÷12 =12+1/25=12又25分之1

(9又7分之2+7又9分之2)÷(7分之5+9分之5)=(65/7+65/9)÷(5/7+5/9)

=65*(1/7+1/9)÷[5*(1/7+1/9)]=65÷5=13

用簡便方法計算下面各題(脫式計算)

4樓:童年笑語

125x4+125x8

=500+1000

=1500

5樓:閒來跟帖

125×(4+8)

=125x4+125x8

=500+1000

=1500

700÷(35×2)

=700÷70

=100

53×101-53

=53×(101-1)

=53×100

=5300

180÷5÷4

=180÷(4×5)

=180÷20

=970×8×5

=70×(8×5)

=70×40

=2800

2800<3000

答一星期(5天)不能完成3000張的印刷

6樓:文軒永遠愛你

125×4×3=1500

7樓:致命的殤

125乘4+125乘8

用簡便方法計算下列各題(要有過程,脫式計算)

8樓:匿名使用者

0.78×98

=0.78×(100-2)

=0.78×100-0.78×2

=78-1.56

=76.44

3.6×1.9+0.36×81

=3.6×1.9+3.6×8.1

=3.6×(1.9+8.1)

=3.6×10

=367.6×2.4+6.

5×7.6+7.6+0.

76=7.6×2.4+7.

6×6.5+7.6×1+7.

6×0.1=7.6×(2.

4+6.5+1+0.1)

=7.6×10=76

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