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解方程, 5×4/5+6x=8 (0.4+x)×6=5.4

解:0.5(6x+0.4)=8 6x+0.4=8÷0.5 6x+0.4=16 6x=16-0.4 6x=15.6 x=15.6÷6 x=2.6

0.4+x=5.4/6 0.4+x=0.9 x=0.9-0.4 x=0.5

5x=6.5×4 x=26÷5 x=5.2

0.4x+3/5x=6 0.4x+0.6x=6 x=6

(1)0.8x-0.5x=1.2 0.3x=1.2 0.3x÷0.3=1.2÷0.3 x=4;检验:把x=4代入原方程,左边=0.8×4-0.5×4=3.2-2=1.2,右边=1.2,因为左边=右边,所以x=4是原方程的解.(2)3×1.5+4x=14.5 4.5+4x=14.5 4.5+4x-4.5=14.5-4.5 4x=10 4x÷4=10÷4 x=2.5;检验:...

因题干不全,条件不足,无法解答。

(1)2x÷23=28, 2x÷23×23=28×23, 2x÷2=644÷2, x=322; (2)6×(5+x)=32, 6×(5+x)÷6=32÷6, 5+x=513, 5+x-5=513-5, x=13;(3)3x-0.4×6=1.5, 3x-2.4+2.4=1.5+2.4, 3x=3.9, 3x÷3=3.9÷3, x=1.3; (4)x-0.86x=3.08, 0.14x=3.08,0...

(x²-x)²-4(x²-x)-12=0 (x²-x+2)(x²-x-6)=0 x²-x+2=0(b²-4ac=-7 无实数根), x²-x-6=0 (x+2)(x-3)=0 X1=-2,X2=3

(1)5.4+2x=8.6, 5.4+2x-5.4=8.6-5.4, 2x=3.2, 2x÷2=3.2÷2, x=1.6;(2)2.5:5=x:8, 5x=2.5×8, 5x=20, 5x÷5=20÷5, x=4;(3)0.2=1-x24, 0.2+x24=1-x24+x24, 0.2+x24=1,0.2-0.2+x24=1-0.2, x24=0.8, x=0.8×24, x=19.2;(4)34...

①16×8-7x=23, 128-7x=23, 128-7x+7x=23+7x, 128=23+7x, 23+7x-23=128-23, 7x=105, 7x÷7=105÷7, x=15; ②5x+15=60,5x+15-15=60-15, 5x=45, 5x÷5=45÷5, x=9;③3x+x=88, 4x=88, 4x÷4=88÷4, x=22; ④3(x+9)=54,3(x+9)÷3=54÷3, x...

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