如图,已经涂了一格,请你接着涂,使涂色部分占整个图形的 , 并根据涂色的过程,写出一道分数加法算式:□+□=□
0.8x-7.5=0.54 27x+31x=145 x-217+29=48
11x-0.5×2=10 x÷15=180 3.6x÷2=2.16
× = ÷12= + = -
3.4+ = ÷ = ×10= 2× ÷2× =
+ = +0.625= - = - = 112=
1- = 2.5- = 1- - = -( - )=
用文字表达解题思路: