4x-(20-x)=5x+6(7-x)
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62
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相关问题
5x+3.5×4=38 16x-2x=7 5(x+7)=35 6x+4x=52 20÷(x-6)=4 7x-15=4x
(2X2)/1X3+(4X4)/(3X5)+(6X6)/(5X7)+...+(20X20)/(19X21)==?
(4)1/6(3x-6)=2/5x-3 (5)3(x-7)+5(x-4)=15 (6)4x-3(20-x)=-4
(4X+20)/4=(6X-20)/5怎样算 (4X+20)/4-2=(6X-20)/5 (4X+20)/4+2=(6X
(x/6+x/6+20):(x-x/6-x/6-20)=7:5具体怎么解?
(X+5)/(X+4) +(X+8)/(X+7 )=(X+7)/(X+6 )+(X+6)/(X+5 )
4x-3(20-x)=5x-7(20-x)
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.
解下列方程:(1)3x-7+6x=4x-8;(2)4x-3(20-x)=5x-7(20-x);(3) 2x-1 3 -
f(x)=(x+4)^4*(x+5)^5*(x+6)^6*(x+7)^7 求导