(1-
)÷(1+75%)
解:
(1-

)÷(1+75%),
=

÷1.75,
=

.
分析:先算小括號里面的減法和加法,再算除法.
點(diǎn)評:在有括號的算式里,要先算括號里面的,然后再進(jìn)一步計(jì)算即可.
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