作业帮计算; [(-8)²-2×(-8)×1/4]÷(-27) 化简：5a²-[a²-[a²-(-2a-5a²)-2(a²-3解方程：x-4x-2/6=1-2x/34/5[5/4-(-x+2)-10]+1=0解方程组：y/2+x/3=13y/3-x/4=3x/2+y/3=22x+3y=285a²-[a²-[a²-(-2a-5a²)-2(a&s
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![计算; [(-8)²-2×(-8)×1/4]÷(-27) 化简：5a²-[a²-[a²-(-2a-5a²)-2(a²-3解方程：x-4x-2/6=1-2x/34/5[5/4-(-x+2)-10]+1=0解方程组：y/2+x/3=13y/3-x/4=3x/2+y/3=22x+3y=285a²-[a²-[a²-(-2a-5a²)-2(a&s](/uploads/image/z/2991573-45-3.jpg?t=%E8%AE%A1%E7%AE%97%3B+%5B%28-8%29%26sup2%3B-2%C3%97%28-8%29%C3%971%2F4%5D%C3%B7%28-27%29+%E5%8C%96%E7%AE%80%EF%BC%9A5a%26sup2%3B-%5Ba%26sup2%3B-%5Ba%26sup2%3B-%28-2a-5a%26sup2%3B%29-2%28a%26sup2%3B-3%E8%A7%A3%E6%96%B9%E7%A8%8B%EF%BC%9Ax-4x-2%2F6%3D1-2x%2F34%2F5%5B5%2F4-%28-x%2B2%29-10%5D%2B1%3D0%E8%A7%A3%E6%96%B9%E7%A8%8B%E7%BB%84%EF%BC%9Ay%2F2%2Bx%2F3%3D13y%2F3-x%2F4%3D3x%2F2%2By%2F3%3D22x%2B3y%3D285a%26sup2%3B-%5Ba%26sup2%3B-%5Ba%26sup2%3B-%28-2a-5a%26sup2%3B%29-2%28a%26s)
计算; [(-8)²-2×(-8)×1/4]÷(-27) 化简：5a²-[a²-[a²-(-2a-5a²)-2(a²-3解方程：x-4x-2/6=1-2x/34/5[5/4-(-x+2)-10]+1=0解方程组：y/2+x/3=13y/3-x/4=3x/2+y/3=22x+3y=285a²-[a²-[a²-(-2a-5a²)-2(a&s
计算; [(-8)²-2×(-8)×1/4]÷(-27) 化简：5a²-[a²-[a²-(-2a-5a²)-2(a²-3
解方程：
x-4x-2/6=1-2x/3
4/5[5/4-(-x+2)-10]+1=0
解方程组：
y/2+x/3=13
y/3-x/4=3
x/2+y/3=2
2x+3y=28
5a²-[a²-[a²-(-2a-5a²)-2(a²-3a)]
计算; [(-8)²-2×(-8)×1/4]÷(-27) 化简：5a²-[a²-[a²-(-2a-5a²)-2(a²-3解方程：x-4x-2/6=1-2x/34/5[5/4-(-x+2)-10]+1=0解方程组：y/2+x/3=13y/3-x/4=3x/2+y/3=22x+3y=285a²-[a²-[a²-(-2a-5a²)-2(a&s
1.=(64+4)/(-27)=-68/27
2.=5a^2-[a^2-(a^2+2a+5a^2-2a^2+6a)]
=5a^2-(a^2-4a^2-8a)
=5a^2+3a^2+8a
=8a(a+1)
3.6x-24x-2=6-4x
14x=-8
x=-4/7
4.1-4/5(-x+2)-8+1=0
5+4x-8-35=0
4x=38
x=19/2
5.y/2+x/3=13(1)
y/3-x/4=3(2)
(1)*2-(2)*3得
17/12*x=17
x=12
代入(1)得：y=18
6.x/2+y/3=2(1)
2x+3y=28(2)
(2)-(1)*4得
5/3*y=20
y=12
代入(2)得：x=-4