45+8=              36+12=           42﹣15=           17+66=          59+30=
56+22=             77+0=            368﹣368=         100﹣51=        80+13=
51﹣47=            600+230=         31﹣21=           94﹣67=         70﹣34=
52﹣16=            70﹣19=          22﹣8=            53﹣47=         8×6=
77+33=             500﹣120=        73+37=            51﹣40=         4×7=
87﹣29=            11+99=           9×4=             166﹣50﹣50=    572+44+56=
171﹣84+84=        41﹣（35+6）=    47+95﹣47=        80+80+80=       411﹣352﹣48=
196+197+198+199=    58﹣120+62+77=