递等式计算(能简便计算用简便计算):4-917-817=913-(913-211)=30.8÷[14-(9.85+1.07)]=56+38-18=-数学
题文
递等式计算(能简便计算用简便计算):
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答案
(1)4-
=4-(
=4-1, =3; (2)
=
=
(3)30.8÷[14-(9.85+1.07)], =30.8÷[14-10.92], =30.8÷3.08, =10; (4)
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=
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题文
递等式计算(能简便计算用简便计算):
|
答案
(1)4-
=4-(
=4-1, =3; (2)
=
=
(3)30.8÷[14-(9.85+1.07)], =30.8÷[14-10.92], =30.8÷3.08, =10; (4)
=
=
=
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