问题
解答题
解方程. ①x:24=24:16 ②
③2x-1.65+2.35=7. |
答案
①x:24=24:16
16x=24×24,
16x=576,
16x÷16=576÷16,
x=36;
②
x+1 2
x=28,3 8
x=28,7 8
x÷7 8
=28÷7 8
,7 8
x=32;
③2x-1.65+2.35=7,
2x-1.65+2.35-2.35=7-2.35,
2x-1.65=4.65,
2x-1.65+1.65=4.65+1.65,
2x=6.3,
2x÷2=6.3÷2,
x=3.15.