如题所述
175Ⅹ19
=175Ⅹ(20-1)
=175x20-175
=3500-175
=3325
=175Ⅹ(20-1)
=175x20-175
=3500-175
=3325
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第1个回答 2020-06-08
175 × 19
= 175 × (20- 1)
= 175 × 20 - 175
= 3500 - 175
= 3500 - 200 + 25
= 3325
= 175 × (20- 1)
= 175 × 20 - 175
= 3500 - 175
= 3500 - 200 + 25
= 3325
第2个回答 2020-06-08
把19=20-1,再分别计算就行
175*19
=175*(20-1)
=175*20-175
=3500-175=3325
175*19
=175*(20-1)
=175*20-175
=3500-175=3325