单项式3ab,2ab,-3ab,-4ab,3ab的和为 ______.单项式3ab,2ab,-3ab,-4ab,3ab的和为 ______.

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单项式3ab,2ab,-3ab,-4ab,3ab的和为 ______.单项式3ab,2ab,-3ab,-4ab,3ab的和为 ______.
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单项式3ab,2ab,-3ab,-4ab,3ab的和为 ______.单项式3ab,2ab,-3ab,-4ab,3ab的和为 ______.
单项式3ab,2ab,-3ab,-4ab,3ab的和为 ______.
单项式3ab,2ab,-3ab,-4ab,3ab的和为 ______.

单项式3ab,2ab,-3ab,-4ab,3ab的和为 ______.单项式3ab,2ab,-3ab,-4ab,3ab的和为 ______.
3ab+2ab+(-3ab)+(-4ab)+3ab =(3ab-4ab)+(2ab+3ab)-3ab =-ab+5ab-3ab