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10 questions
5−3 =
531
−53
5−31
7−2 =
−72
491
−491
521 =
− 52
5−21
5−2
2−9 ×26 =
23
231
−2−3
5−6×58 =
52
5−2
251
7−10
710
7101
7×10
107
a−4=
a41
a4
4a
4a
m51=
51
m51
m5
m−5
a−7=
a71
a7
7a
7a
⌊32⌋−2
341
321
34
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