解方程.3x+1.8×3=17.4 &
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解方程.
3x+1.8×3=17.4
2(x+1.5)=12.6
17x+3x=6.
3x+1.8×3=17.4
2(x+1.5)=12.6
17x+3x=6.
![解方程.3x+1.8×3=17.4 &](/uploads/image/z/15444042-42-2.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%EF%BC%8E3x%2B1.8%C3%973%3D17.4%26nbsp%3B%26nbsp%3B%26nbsp%3B%26nbsp%3B%26nbsp%3B%26nbsp%3B%26nbsp%3B%26)
(1)3x+1.8×3=17.4
3x+5.4=17.4
3x+5.4-5.4=17.4-5.4
3x=12
3x÷3=12÷3
x=4
(2)2(x+1.5)=12.6
2(x+1.5)÷2=12.6÷2
x+1.5=6.3
x+1.5-1.5=6.3-1.5
x=4.8
(3)17x+3x=6
20x=6
20x÷20=6÷20
x=0.3
3x+5.4=17.4
3x+5.4-5.4=17.4-5.4
3x=12
3x÷3=12÷3
x=4
(2)2(x+1.5)=12.6
2(x+1.5)÷2=12.6÷2
x+1.5=6.3
x+1.5-1.5=6.3-1.5
x=4.8
(3)17x+3x=6
20x=6
20x÷20=6÷20
x=0.3