8
我会解决问题
文具店有促销活动，满80元减15元。

(1)一本比一根便宜多少元？ $□ ◯ □ = □$(元)
(2)买哪两件商品可以参与满减活动？(在横线上填写商品的序号)实际需要付多少元？
买和。$□ ◯ □ ◯ □ = □$(元)
$16 + 15 =$ $26 - 16 =$ $39 + 21 =$
$49 - 25 =$ $37 + 23 =$ $53 + 24 =$
$25 - 15 =$ $18 + 22 =$ $23 + 48 =$
$47 + 23 =$ $56 + 24 =$ $37 - 29 =$
$29 + 11 =$ $47 + 30 =$ $45 + 25 =$
$38 + 22 =$ $27 + 29 =$ $43 + 28 =$
$77 + 20 =$ $28 + 33 =$ $37 + 26 =$
$37 + 3 =$ $56 - 10 =$ $85 - 5 =$
$62 - 26 =$ $18 + 19 =$ $40 - 22 =$
$72 - 21 =$ $31 + 6 =$ $43 - 7 =$
$30 - 10 + 40 =$ $21 + 18 - 23 =$ $67 - 32 + 15 =$

(1) $14-7=7$
(2) 买④和⑤, $26+65-15=76$
$16+15=31$
$26-16=10$
$39+21=60$
$49-25=24$
$37+23=60$
$53+24=77$
$25-15=10$
$18+22=40$
$23+48=71$
$47+23=70$
$56+24=80$
$37-29=8$
$29+11=40$
$47+30=77$
$45+25=70$
$38+22=60$
$27+29=56$
$43+28=71$
$77+20=97$
$28+33=61$
$37+26=63$
$37+3=40$
$56-10=46$
$85-5=80$
$62-26=36$
$18+19=37$
$40-22=18$
$72-21=51$
$31+6=37$
$43-7=36$
$30-10+40=60$
$21+18-23=16$
$67-32+15=50$