
展开全部
666✖️99+669
=666x99+666+3
=666x(99+1)+3
=666x100+3
=66600+3
=66603
34✖️102-68
=34x102-34x2
=34x(102-2)
=34x100
=3400
=666x99+666+3
=666x(99+1)+3
=666x100+3
=66600+3
=66603
34✖️102-68
=34x102-34x2
=34x(102-2)
=34x100
=3400
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