99 x 4 = 396

99 x4= 396

chúc bạn học tốt

y65rit45y['kire89ru9eyotei9qehjdyw8ew36w343546

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kết quả =330

153+300 - 123 = 330

Chúc bạn học tốt nhé

Vì \(M\) là trung điểm \(AB\) (giả thiết)

\(\Rightarrow MA=MB=\frac{AB}{2}=\frac{86}{2}=43cm\)

Vậy độ dài đoạn thẳng MB = 43 cm

Bài giải 

Ngày thứ hai xưởng đó làm được số đôi giày là :

                        7021 - 815 = 6206 ( đôi )

                                 Đáp số : 6206 đôi giày.

Bài giải 

Chu vi của hình chữ nhật là : 

(16+12)x2=56(cm)

Vì chu vi hình vuông bằng chu vi hình chữ nhật nên chu vi hình vuông là: 56cm 

Cạnh của hình vuông là :

56 : 4 = 14 ( cm )

Diện tích hình vuông là :

14 x 14 = 196 ( cm2 )

           Đáp số : 196 cm2

  Chu vi hình chữ nhật là:

     \(\left(12+16\right)\times2=56\left(cm\right)\)

  Cạnh hình vuông có chiều dài là:

      \(56\div4=14\left(cm\right)\)

  Diện tích  hình vuông là:

     \(14\times14=196\left(cm\right)\)

Vậy diện tích hình vuông đó là:196cm

Chu vi hình chữ nhật là:

             (16+12} nhân 2 = 56 (cm}

Vì chu vi hình vuông bằng chu vi hình chữ nhật nên chu vi hình vuông là: 56cm

Cạnh hình vuông là:

             56:4=14 (cm}

Diện tích hình vuông là:

           14 nhân 14=196(cm2}

                             Đáp số:196cm2.

xin lỗi bn tính diện tích hình vuông mình viết xăng ti mét vuông lại thành cm2 xăng ti mét vuông viết giống thế nhưng cm có số 2 nhỏ ở trên chữ cm

2469225486

2469225486

a) Chu vi sân chơi là:

\(8\times4=32\)m

Diện tích sân chơi là:

\(8\times8=64\)\(m^2\)

Đ/S : Tự ghi

\(\text{a) Chu vi sân chơi đó là :}\)

\(\text{ 8 x 4 = 32 ( m )}\)

\(\text{b)Diện tích sân chơi đó là:}\)

\(\text{8 x 8 = 64 ( m2}\)

\(\text{Đáp số : a) 32 m ; b) 64 m2}\)

Mình làm là 2 cách nên bạn chọn cách nào cũng đc nhé!

Cách 1:

Số bóng đèn hai đội đã mang đi là:

37 000 + 42 000 = 79 000 (bóng)

Số bóng đèn còn lại là:

90 000 – 79 000 = 11 000 (bóng)

Đáp số: 11 000 bóng đèn.

Cách 2:

Số bóng đèn còn lại là:

90 000 – (37 000 + 42 000) = 11 000 (bóng)

Đáp số: 11 000 bóng đèn.