Question

已知8x-2.5×8=24.8，那么0.38+1.2x=

7.1

．

Answer 1

分析：先求出方程8x-2.5×8=24.8的值即可，然后把未知數(shù)x的值代入0.38+1.2x進(jìn)行計(jì)算即可．

解答：解：8x-2.5×8=24.8
       8x-20=24.8
          8x=44.8
           x=5.6
把x=5.6代入0.38+1.2x
=0.38+1.2×5.6
=0.38+6.72
=7.1
故答案為：7.1．

點(diǎn)評(píng)：本題先計(jì)算出x的值，然后進(jìn)一步求出式子0.38+1.2x的值即可．