化简:【1】3a-[5a-(2qa-1)] 【2】(5x2+3x-2)-(-6 x2-4-1) 【3】4分之x+2 -
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/08/31 12:13:17
化简:【1】3a-[5a-(2qa-1)] 【2】(5x2+3x-2)-(-6 x2-4-1) 【3】4分之x+2 - 6分之2x+3
化简:
【1】3a-[5a-(2qa-1)]
=3a-(5a-2qa+1)
=3a-5a+2qa-1
= -2a+2qa-1
【2】(5x2+3x-2)-(-6 x2-4-1)
=5x2+3x-2+6x2+4+1
=11x2+3x+3
【3】4分之x+2 - 6分之2x+3
=1/4x+2-2/6x+3
=3/12x+2-4/12x+3
= -1/12x+5
再问: 不好意思啊,第一题我打错了,正确的题目是:3a-[5a-(2a-1)]
再答: 题目:3a-[5a-(2a-1)] =3a-(5a-2a+1) =3a-5a+2a-1 = -1
【1】3a-[5a-(2qa-1)]
=3a-(5a-2qa+1)
=3a-5a+2qa-1
= -2a+2qa-1
【2】(5x2+3x-2)-(-6 x2-4-1)
=5x2+3x-2+6x2+4+1
=11x2+3x+3
【3】4分之x+2 - 6分之2x+3
=1/4x+2-2/6x+3
=3/12x+2-4/12x+3
= -1/12x+5
再问: 不好意思啊,第一题我打错了,正确的题目是:3a-[5a-(2a-1)]
再答: 题目:3a-[5a-(2a-1)] =3a-(5a-2a+1) =3a-5a+2a-1 = -1
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