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(大)x÷60=大4(x)7口x-大5=0.口5(5)(大+x5)x=x4(4)70-4.口x=0.4(5)55-70x=5(6)x+x7=大6.

题目详情
(大)x÷60=大4
(x)
7
x-大5=0.口5
(5)(大+x5)x=x4
(4)70-4.口x=0.4
(5)55-70x=5
(6)x+
x
7
=大6.
▼优质解答
答案和解析
(x)x÷60=xk,x÷60×60=xk×60, x=8k0;(2) 7 8 x-x5=0.85, 7 8 x-x5+x5=0.85+x5, 7 8 x=x5.85, 7 8 x÷ 7 8 =x5.85÷ 7 8 , ...