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30×(□+3)=30□+90
30×□+3=30□+3
(30□+90)-(30□+3)=90-3=87
88×2+88×22+8888
=88×2+88×22+8800+88×1
=88×(2+22+1)+8800
=88×25+8800
=(80+8)×25+8800
=80×25+8×25+8800
=2000+200+8800
=11000
32×2222+12×3333
=32×2×1111+12×3×1111
=(64+36)×1111
=100×1111
=111100
30×□+3=30□+3
(30□+90)-(30□+3)=90-3=87
88×2+88×22+8888
=88×2+88×22+8800+88×1
=88×(2+22+1)+8800
=88×25+8800
=(80+8)×25+8800
=80×25+8×25+8800
=2000+200+8800
=11000
32×2222+12×3333
=32×2×1111+12×3×1111
=(64+36)×1111
=100×1111
=111100
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