用简便方法计算下面各题(8-2.75)/2.5+1.09 22.6-5.4*0.4 42.41+34.5/(14.75-12.25
1个回答
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(8-2.75)/2.5+1.09
=[(8-2.75)*4]/[2.5*4]+1.09
=(32-11)/10+1.09
=2.1+1.09
=3.19
22.6-5.4*0.4
= 22.6-2.16
=21
42.41+34.5/(14.75-12.25)
= 42.41+34.5/2.5
= 42.41+(34.5*4)/(2.5*4)
= 42.41+138/10
= 42.41+13.8
=56.21
=[(8-2.75)*4]/[2.5*4]+1.09
=(32-11)/10+1.09
=2.1+1.09
=3.19
22.6-5.4*0.4
= 22.6-2.16
=21
42.41+34.5/(14.75-12.25)
= 42.41+34.5/2.5
= 42.41+(34.5*4)/(2.5*4)
= 42.41+138/10
= 42.41+13.8
=56.21
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