用递等式计算,能简算的要用简便方法计算.?
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解题思路:(1)先算括号内的除法,再算括号内的加法,最后算括号外的乘法.
(2)小算小括号内的,在算中括号内的,最后算括号外的.
(3)把除法变为乘法,把0.25化为分数,运用乘法分配律简算.
(1)[4/15]×([3/8]+[6/5]÷[8/5])
=[4/15]×([3/8]+[6/5]×[5/8])
=[4/15]×([3/8]+[3/4])
=[4/15]×[9/8]
=[3/10]
(2)[8/25]÷[[4/9]×(2-[7/5])]
=[8/25]÷[[4/9]×[3/5]]
=[8/25]÷[4/15]
=[8/25]×[15/4]
=[6/5]
(3)0.6÷4+1.4×0.25
=0.6×[1/4]+1.4×[1/4]
=(0.6+1.4)×[1/4]
=2×[1/4]
=[1/2]
,10,用递等式计算,能简算的要用简便方法计算.
[4/15]×([3/8]+[6/5]÷[8/5])
[8/25]÷[[4/9]×(2-[7/5])]
0.6÷4+1.4×0.25.
(2)小算小括号内的,在算中括号内的,最后算括号外的.
(3)把除法变为乘法,把0.25化为分数,运用乘法分配律简算.
(1)[4/15]×([3/8]+[6/5]÷[8/5])
=[4/15]×([3/8]+[6/5]×[5/8])
=[4/15]×([3/8]+[3/4])
=[4/15]×[9/8]
=[3/10]
(2)[8/25]÷[[4/9]×(2-[7/5])]
=[8/25]÷[[4/9]×[3/5]]
=[8/25]÷[4/15]
=[8/25]×[15/4]
=[6/5]
(3)0.6÷4+1.4×0.25
=0.6×[1/4]+1.4×[1/4]
=(0.6+1.4)×[1/4]
=2×[1/4]
=[1/2]
,10,用递等式计算,能简算的要用简便方法计算.
[4/15]×([3/8]+[6/5]÷[8/5])
[8/25]÷[[4/9]×(2-[7/5])]
0.6÷4+1.4×0.25.
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