4
3
×
1
9
-
1
9
=0
×
×
.(判斷對(duì)錯(cuò))
分析:先根據(jù)四則混合運(yùn)算的順序以及分?jǐn)?shù)乘法的法則,先計(jì)算出正確的答案,再進(jìn)行判斷即可.
解答:解:
3
4
×
1
9
-
1
9

=
1
12
-
1
9

=-
1
36
,
原題說(shuō)法錯(cuò)誤.
故答案為:×.
點(diǎn)評(píng):本題考查了學(xué)生通過(guò)約分對(duì)分?jǐn)?shù)四則混合運(yùn)題目進(jìn)行計(jì)算的能力,要注意運(yùn)算順序.
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