问题
解答题
计算：（1）-3y+0.75y-0.25y；（2）5a-1.5a+2.4a
答案
（1）-3y+0.75y-0.25y
=（-3+0.75-0.25）y
=-2.5y．
（2）5a-1.5a+2.4a
=（5-1.5+2.4）a
=5.9a．
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计算：（1）-3y+0.75y-0.25y；（2）5a-1.5a+2.4a
（1）-3y+0.75y-0.25y
=（-3+0.75-0.25）y
=-2.5y．
（2）5a-1.5a+2.4a
=（5-1.5+2.4）a
=5.9a．