问题 解答题
解方程:
①16-8x=6.4②2.4x-7×5=13③1.4x÷0.8=35④3.2x+1.6x=0.48.
答案

①16-8x=6.4,

16-8x+8x=6.4+8x,

16=8x+6.4,

16-6.4=8x+6.4-6.4,

8x=9.6,

8x÷8=9.6÷8,

x=1.2;

②2.4x-7×5=13,

2.4x-35+35=13+35,

2.4x=48,

x=20;

③1.4x÷0.8=35,

1.4x÷0.8×0.8=35×0.8,

1.4x=28,

1.4x÷1.4=28÷1.4,

x=20;

④3.2x+1.6x=0.48,

4.8x=0.48,

4.8x÷4.8=0.48÷4.8,

x=0.1.

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