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多项式化简2y+(-2y+5)-(3y+2)=
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多项式 化简 2y+(-2y+5)-(3y+2)=
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括号之前是加号,去掉括号,原括号里面的符号不变;括号之前是减号,去掉括号,原括号里面的符号都要变,所以:‘
2y+(-2y+5)-(3y+2)
=2y-2y+5-3y-2
=5-2+2y-2y-3y
=(5-2)+(2y-2y-3y)
=3-3y
2y+(-2y+5)-(3y+2)
=2y-2y+5-3y-2
=5-2+2y-2y-3y
=(5-2)+(2y-2y-3y)
=3-3y
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