问题 解答题
解方程.
5.6+χ=10
5χ=1.3
χ÷0.08=2.5χ-0.42=6.9
答案

(1)5.6+x=10

5.6+x-5.6=10-5.6

x=4.4;

(2)5x=1.3

5x÷5=1.3÷5

x=0.26;

(3)x÷0.08=2.5

x÷0.08×0.08=2.5×0.08

x=0.2;

(4)x-0.42=6.9

x-0.42+0.42=6.9+0.42

x=7.32.

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