口算.
6×7=9×9=3×6=2×6=8×3+4=36+4=8×7=2×2=9+57=3×4+9=5×6=18+60=9×3=5×5=38-18+25=41-2=6×9=8×5=7×2=7×5-3=
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解:
6×7=42??? 9×9=81??? 3×6=18????2×6=12????8×3+4=28
36+4=40????8×7=56????2×2=4????9+57=66?????3×4+9=21
5×6=30????18+60=78????9×3=27???5×5=25????38-18+25=45
41-2=39????6×9=54????8×5=40???7×2=14?????7×5-3=32
故