问题
解答题
解方程
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答案
(1)8x+42=82,
8x+42-42=82-42,
8x=40,
8x÷8=40÷8,
x=5;
(2)
×6-30%=1.7x,7 3
14-30%=1.7x,
13.7=1.7x,
13.7÷1.7=1.7x÷1.7,
x=8
;1 17
(3)65%x-35%x=6.5,
30%x=6.5;
30%x÷30%=6.5÷30%,
x=21
;2 3
(4)58%x+23%x=1.62,
81%x=1.62,
81%x÷81%=1.62÷81%,
x=2.