解下列方程:(1)4/3-8x=3-11/2x; (2)0.5x-0.7=6.5-1.3x; (3)1/6(3x-6)=
解下列方程:(1)4/3-8x=3-11/2x; (2)0.5x-0.7=6.5-1.3x; (3)1/6(3x-6)=2/5x-3; (4)1-2x/3=3x+1/7-3;
当x为何值时,下列各组中两个式子的值相等?
(1)x-(x-1)和7-(x+3)/5;
(2)2/5x+(x-1)/2和3(x-1)/2-8/5x
在梯形面积公式S=1/2(a+b)h中
(1)已知S=30,a=6,h=4,求b;
(2)已知S=60,b=4,h=21,求a;
(3)已知S=50,a=6,b=5/3a,求h;