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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