火眼金睛辨對錯,并且改正.
(1)21.32-(6.32+8.3)
=21.32-6.32+8.3
=15+8.3
=23.3××.(判斷對錯)改正:21.32-(6.32+8.3)
=21.32-6.32-8.3
=15-8.3
=6.6821.32-(6.32+8.3)
=21.32-6.32-8.3
=15-8.3
=6.68.
(2)12.45-1.35-0.65
=12.45-(1.35+0.65)
=12.45-2
=10.45√√.(判斷對錯)改正:無需改正無需改正.
=21.32-6.32-8.3
=15-8.3
=6.68
=21.32-6.32-8.3
=15-8.3
=6.68
【考點】小數(shù)四則混合運算;運算定律與簡便運算.
【答案】×;21.32-(6.32+8.3)
=21.32-6.32-8.3
=15-8.3
=6.68;√;無需改正
=21.32-6.32-8.3
=15-8.3
=6.68;√;無需改正
【解答】
【點評】
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發(fā)布:2024/5/27 14:0:0組卷:3引用:1難度:0.9