问题 解答题
求未知数x
9×3-
17
10
x=13.4
x
6.4
=1.5:0.12.
答案

(1)9×3-

17
10
x=13.4,

27-1.7x=13.4,

27-1.7x+1.7x=13.4+1.7x,

13.4+1.7x=27,

13.4+1.7x-13.4=27-13.4,

1.7x=13.6,

1.7x÷1.7=13.6÷1.7,

x=8;

(2)

x
6.4
=1.5:0.12,

0.12x=6.4×1.5,

0.12x=9.6,

0.12x÷0.12=9.6÷0.12,

x=80.

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