问题
解答题
解方程
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答案
(1)
+8 9
x=2,1 9
+8 9
x-1 9
=2-8 9
,8 9
x=1 9
,10 9
x×9=1 9
×9,10 9
x=10;
(2)5.4x+2.6x=840,
(5.4+2.6)x=840,
8x=840,
8x÷8=840÷8,
x=105;
(3)1.75x÷14=0.5,
1.75x÷14×14=0.5×14,
1.75x=7,
1.75x÷1.75=7÷1.75,
x=4.