考點(diǎn):解一元一次方程
專題:
分析:(1)先移項(xiàng),再合并同類項(xiàng),最后系數(shù)化為1即可;
(2)先去括號(hào),再移項(xiàng)合并同類項(xiàng),最后系數(shù)化為1即可;
(3)先移項(xiàng),再合并同類項(xiàng),最后系數(shù)化為1即可;
(4)先去括號(hào),再移項(xiàng)合并同類項(xiàng),最后系數(shù)化為1即可.
解答:解:(1)移項(xiàng)得:
x+x=3-1,
合并同類項(xiàng)得:
x=2,
系數(shù)化成1得:x=
;
(2)去括號(hào)得:4x+4=10x+5
移項(xiàng)合并同類項(xiàng)得:6x=-1,
系數(shù)化為1得:x=-
;
(3)移項(xiàng)得:7x+3x=16-6,
合并同類項(xiàng)得:10x=10,
系數(shù)化為1得:x=1;
(4)去括號(hào)得:1-4x-6=-6x-3,
移項(xiàng)得:6x-4x=6-3-1,
合并同類項(xiàng)得:2x=2,
系數(shù)化為1得:x=1.
點(diǎn)評(píng):本題主要考查一元一次方程的解法,解一元一次方程的一般步驟為:①去分母,②去括號(hào),③移項(xiàng),④合并同類項(xiàng),⑤系數(shù)化成1.