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202X45簡便計算

2022-11-06 16:50

2022-11-06 20:01

202×45
=（200+2）×45
=200×45+2×45
=9000+90
=9090

202X45
=200×45+2×45
=9000+90
=9090

200×45+2×45=900+90=990

(202-2）×45=200×45.