解方程2(3x+4)-5(2x-7)=42

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解方程2(3x+4)-5(2x-7)=42解方程2(3x+4)-5(2x-7)=42解方程2(3x+4)-5(2x-7)=422(3x+4)-5(2x-7)=426x+8-10x+35=4243-42

解方程2(3x+4)-5(2x-7)=42
解方程2(3x+4)-5(2x-7)=42

解方程2(3x+4)-5(2x-7)=42
2(3x+4)-5(2x-7)=42
6x+8-10x+35=42
43-42=10x-6x
4x=1
x=1/4

2(3x+4)-5(2x-7)=42
解:6x+8-10x+35=42
43-4x=42
4x=1
x=0.25

2(3x+4)-5(2x-7)=42
6x+8-10x+35=42
4x=1
x=0.25

6x+8-10x+35=42
-4x+43=42
4x=1
x=1/4

2(3X+4)-5(2X-7)=42可写成6X+8-(10X-35)=42再可写成6X+8-10X+35=42则可以写成 6X-10X=42-35-8 经过计算可得—4X=-1 计算可得 X=1/4=0.25

6x+8-10x+35=42
-2x=-1
x=1/2

x=0.25

6x+8-10x+35=42 x等于四分之一