在下面的算式里加上括号,使算式成立.7×9+12÷3-2=23; 7×9+12÷3-2=75;90-60÷15+5×9=47;
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根据四则混合计算顺序可知:
(1)(7×9+12)÷3-2=23
(2)7×9+12÷(3-2)=75
(3)(90-60)÷15+5×9=47
(4)90-(60÷15+5×9)=41
======以下答案可供参考======
供参考答案1:
7×9+12÷(3-2)=75
(7×9+12)÷3-2=23
90-60÷15+5×9=41
90-60÷15+5×9=41
(本来就是嘛)供参考答案2:
7×9+12÷(3-2)=75
(7×9+12)÷3-2=23
90-60÷15+5×9=41
90-60÷15+5×9=41