好吧问答库 > 计算与化简（1）计算：?24÷[1?(?3)2]+(23?35)×(?15)；（2）先化简，再求值：3x+6x2?3(23x2+x)，其中x=-

计算与化简（1）计算：?24÷[1?(?3)2]+(23?35)×(?15)；（2）先化简，再求值：3x+6x2?3(23x2+x)，其中x=-

2025年04月08日 09:42
有1个网友回答
网友（1）：

（1）?24÷[1?(?3)2]+(

2
3
?
3
5
)×(?15)
=-16÷[1-9]+（-10+9）
=-16÷[-8]-1
=2-1
=1；

（2）3x+6x2?3(
2
3
x2+x)
=3x+6x2-2x2-3x
=4x2，
当x=-5时，原式=4×（-5）2=100；

（3）5(x?
2
3
)＝
4
3
+(x?
2
3
)
4（x-
2
3
）=
4
3
，
x-
2
3
=
1
3
，
x=1；

（4）
0.5x+0.9
0.5
+
x?5
3
＝
0.01+0.02x
0.03
，
原方程化为 
5x+9
5
+
x?5
3
＝
1+2x
3
，
去分母，得3（5x+9）+5（x-5）=5（1+2x），
化简，得10x=3，
解得x＝
3
10
．

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