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5X十7=42怎么解

42-7÷5 =7

5x=42-7 5x=35 x=7

5x=35 x=7 很高兴为你作答,如果你对我的回答满意,请【采纳为满意答案】,谢谢

(1)5x-4×7=42 5x-28=42 5x-28+28=42+28 5x=70 5x÷5=70÷5 x=14(2)x-0.9x=81.9 0.1x=81.9 0.1x÷0.1=81.9÷0.1 x=819(3)12.3+5x=37.312.3+5x-12.3=37.3-12.3 5x=25 5x÷5=25÷5 x=5(4)4(0.3+x)=6.8 4(0.3+x)÷4=6.8÷4 0.3+x=1.7 0.3+x-0.3=...

(5x-4)✖️7=42 5x-4=42÷7 5x-4=6 5x=6+4 5x=10 x=10÷5 x=2

5x=35 x=7

5X-3x10/7=7/5 5X=30/7+7/5 X=6/7+7/25 通分X=(150+49)/175 X=199/175

5×=15 ×=3

解:5x - 4.7x = 7/10 即 0.3x = 0.7 两边除以0.3,即 x=7/3

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