100=5.4 10=0.013
51×49+720÷48 618-936÷(35+17)
(127+209)÷12×45 960÷[4×(204-189)]
32.58+3.67= ※1.2-0.93=
3支
( )元
( )支
?元
2﹣30%= +25%= 4.23﹣23%= ×=
3+= 4×15%= = +50%=