Khi đặt tích riêng thẳng cột thì tổng thu được bằng số đã cho nhân với ﴾4 + 5﴿ = 9
Vậy số đã cho bằng 207 : 9 = 23
Tích đúng bằng 23 x 45 = 1035
Khi đặt tích riêng thẳng cột thì tổng thu được bằng số đã cho nhân với ﴾4 + 5﴿ = 9
Vậy số đã cho bằng 207 : 9 = 23
Tích đúng bằng 23 x 45 = 1035
khi nhân một số với 45,một bạn đã viết các tích riêng thẳng cột với nhau nghĩa là bạn đã lấy thừa số thứ nhất nhân với 4 và 5 rồi cộng các kết quả lại với nhau .Như vậy bạn ấy đã gấp thừa số thứ nhất lên số lần là : 4 + 5 = 9 ( lần )
Vậy 207 chính là 9 lần thừa số thứ nhất .Thừa số thứ nhất là : 207 : 9 = 23
Tích đúng là : 23 x 45 =1035
Đáp số : 1035
khi nhân một số với 45 một bạn đã viết các tích riêng thẳng cột với nhau nghĩa là bạn đã lấy thừa số thứ nhất nhân với 4 và 5 rồi cộng các kết quả lại với nhau .Như vậy bạn ấy đã gấp thừa số thứ nhất lên số lần là : 4 + 5 = 9 (lần )
Vậy 207 chính là 9 lần thừa số thứ nhất .Thừa số thứ nhất là : 207 : 9 = 23
Tích đúng của phép nhân đó là : 23 x 45 = 1035
đáp số : 1035
Khi đặt tích riêng thẳng cột thì tổng thu được bằng số đã cho nhân với ﴾4 + 5﴿ = 9
Vậy số đã cho bằng 207 : 9 = 23
Tích đúng bằng 23 x 45 = 1035
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gọi số cần tìm là x
Ta có: X x(4+5)=207
X x9=207
X=207: 9
X=23
Tích đúng là:23 x45=1035
