问题 解答题
求未知数x.
70x-2.3×7=32.9
x
12
=60%
5:x=2.5:8.
答案

(1)70x-2.3×7=32.9,

70x-16.1+16.1=32.9+16.1,

70x÷70=49÷70,

x=0.7;

(2)

x
12
=60%,

x
12
×12=60%×12,

x=7.2;

(3)5:x=2.5:8,

2.5x=5×8,

2.5x=40÷2.5,

x=16.

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