3a^2b-[4ab^2-5(1/2ab^2+5/3a^2b)-3/2ab^2]-a^2b 算下,3(y-2)+1=5(2y-1) 算下,当x=-3时,代数式(2-m)x+2m+3的值是-7;当x为何值时,这个代数式的值为1?算下2x-1/3-10x+1/6=2x+1/4-1算下3x+0.8/1.2+0.1=x-0.2x-0.1/0.3
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![3a^2b-[4ab^2-5(1/2ab^2+5/3a^2b)-3/2ab^2]-a^2b 算下,3(y-2)+1=5(2y-1) 算下,当x=-3时,代数式(2-m)x+2m+3的值是-7;当x为何值时,这个代数式的值为1?算下2x-1/3-10x+1/6=2x+1/4-1算下3x+0.8/1.2+0.1=x-0.2x-0.1/0.3](/uploads/image/z/5235867-27-7.jpg?t=3a%5E2b-%5B4ab%5E2-5%281%2F2ab%5E2%2B5%2F3a%5E2b%29-3%2F2ab%5E2%5D-a%5E2b+%E7%AE%97%E4%B8%8B%2C3%EF%BC%88y-2%29%2B1%3D5%282y-1%29+%E7%AE%97%E4%B8%8B%2C%E5%BD%93x%3D-3%E6%97%B6%2C%E4%BB%A3%E6%95%B0%E5%BC%8F%282-m%29x%2B2m%2B3%E7%9A%84%E5%80%BC%E6%98%AF-7%EF%BC%9B%E5%BD%93x%E4%B8%BA%E4%BD%95%E5%80%BC%E6%97%B6%2C%E8%BF%99%E4%B8%AA%E4%BB%A3%E6%95%B0%E5%BC%8F%E7%9A%84%E5%80%BC%E4%B8%BA1%3F%E7%AE%97%E4%B8%8B2x-1%2F3-10x%2B1%2F6%3D2x%2B1%2F4-1%E7%AE%97%E4%B8%8B3x%2B0.8%2F1.2%2B0.1%3Dx-0.2x-0.1%2F0.3)
3a^2b-[4ab^2-5(1/2ab^2+5/3a^2b)-3/2ab^2]-a^2b 算下,3(y-2)+1=5(2y-1) 算下,当x=-3时,代数式(2-m)x+2m+3的值是-7;当x为何值时,这个代数式的值为1?算下2x-1/3-10x+1/6=2x+1/4-1算下3x+0.8/1.2+0.1=x-0.2x-0.1/0.3
3a^2b-[4ab^2-5(1/2ab^2+5/3a^2b)-3/2ab^2]-a^2b 算下,
3(y-2)+1=5(2y-1) 算下,
当x=-3时,代数式(2-m)x+2m+3的值是-7;当x为何值时,这个代数式的值为1?
算下
2x-1/3-10x+1/6=2x+1/4-1
算下
3x+0.8/1.2+0.1=x-0.2x-0.1/0.3
3a^2b-[4ab^2-5(1/2ab^2+5/3a^2b)-3/2ab^2]-a^2b 算下,3(y-2)+1=5(2y-1) 算下,当x=-3时,代数式(2-m)x+2m+3的值是-7;当x为何值时,这个代数式的值为1?算下2x-1/3-10x+1/6=2x+1/4-1算下3x+0.8/1.2+0.1=x-0.2x-0.1/0.3
3a^2b-[4ab^2-5(1/2ab^2+5/3a^2b)-3/2ab^2]-a^2b
=3a^2b-[4ab^2-5/2ab^2-25/3a^2b-3/2ab^2]-a^2b
=3a^2b-[3/2ab^2-25/3a^2b-3/2ab^2]-a^2b
=3a^2b+25/3a^2b-a^2b
=31/3a^2b
3(y-2)+1=5(2y-1)
3y-6+1=10y-5
7y=0
y=0
当x=-3时,代数式(2-m)x+2m+3的值是-7;当x为何值时,这个代数式的值为1?
代入:(2-m)*(-3)+2m+3=7
得5m=-4,m=-4/5
则代数式为(2+4/5)x-8/5+3
(2+4/5)x-8/5+3=1
则x=-1/7
2x-1/3-10x+1/6=2x+1/4-1
-8x-1/6=2x-3/4
10x=7/12
x=7/120
3x+0.8/1.2+0.1=x-0.2x-0.1/0.3
3x+2/3+0.1=0.8x-1/3
2.2x=-1.1
x=-0.5
1
孩子,不可以太懒,这些还是自己算比较好吧?多练练手,考试才能考得好