2(3x+1)-3(6x+2)=-(21x+7)=?
5个回答
6x+2-18x-6=-21x-7
-12x-4=-21x-7
9x=-3
x=-1/3
相关问题
判断下列各等式是否正确.(1)2(3x+y)=6x+y(2)6(x-2)=6x-12(3)-7(x+3)=-7x+21(
21-x/2+x/3-2x/5=x x+2/3+x=10-2x/7 9-3x-2/5=7-3x/6
计算题,只要得数2x-7x-3/2x=6+3/21/4x-1/2x=3
1/7(X-1)=2/21(X+3.6-1) 解方程
1x3x5+3x9x15+7x21x35分之1x2x3+3x6x9+7x14x21 等于多少
(2X2)/1X3+(4X4)/(3X5)+(6X6)/(5X7)+...+(20X20)/(19X21)==?
解方程:5x-2=3.6;7(x-1.2)=2.1;7.5×8-4x=20;9.6x-2.4x=21.6;4x-7×1.
解方程组:(1)3x+y/2=x+2y/3=1 (2){6(x-y)-7(x+y)=21①{2(x-y)-5(x+y)=