www.3112.net > (4/5×30%)x=7.2

(4/5×30%)x=7.2

0.8x0.3Xx=7.2 x=7.2÷0.24=30

[4/5-(-8/7)]x(-7)÷(-2) =(28/35+40/35)x7/2 =68/35

解:x-5.2=7.2÷4 x-5.2=1.8 x=

5(x-7.4)=42.5 x-7.4=42.5÷5 x-7.4=8.5 x=8.5

x+3/7-×+2/5=×+1/6-×+4/4 (5x+15-7x-14)/35=(4x+4-

AXB=C 则X=A?1CB?1 下面使用初等变换来求X 3 -1 14 16 5 -2 9 10

2(0.4x+4)-5(0.3x-7)=9 0.8x+8-1.5x+35=9 0.8x-1.5

12.5x+4.5x=5.1, 8x=5.1 ,x=51/80 0.2x+3.8=10 ,0.2

7/4×2.5×4.8÷(7/2×6/5×0.25) =7/4x2.5x4.8/7/2/6/5/0

这是解一元一次方程,通过移项、合并来解、两边同乘以或同除以一个不为0的数来解。 (2/3-1/4)x

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