列算式:(解方程) x÷2-x÷5=90 (7x-3x+59)÷3 =29 3.4-2(x+1.2)=0.6

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列算式:(解方程) x÷2-x÷5=90 (7x-3x+59)÷3 =29 3.4-2(x+1.2)=0.6

列算式:(解方程) x÷2-x÷5=90 (7x-3x+59)÷3 =29 3.4-2(x+1.2)=0.6
列算式:(解方程) x÷2-x÷5=90 (7x-3x+59)÷3 =29 3.4-2(x+1.2)=0.6

列算式:(解方程) x÷2-x÷5=90 (7x-3x+59)÷3 =29 3.4-2(x+1.2)=0.6
x/2-x/5=90
3x/10=90
x=300
(7x-3x+59)/3=29
4x=87-59
x=7
3.4-2(x+1.2)=0.6
x+1.2=1.4
x=0.2

x÷2-x÷5=90
两边*10
5x-2x=900
3x=900
x=300
(7x-3x+59)÷3 =29
两边*3
4x+59=87
4x=27
x=7
3.4-2(x+1.2)=0.6
3.4-2x-2.4=0.6
2x=1.2-0.6
x=0.3

x÷2-x÷5=90
5x/10-2x/10=90
3x/10=90
3x=900
x=300
(7x-3x+59)÷3 =29
4x+59=39*3
4x=117-59
4x=58
x=14.5
3.4-2(x+1.2)=0.6
3.4x-x-2.4=0.6
2.4x=3
x=3/2.4
x=1.25