Câu hỏi:

31/07/2025 5 Lưu

Điền số thích hợp :

\(9{m^2} = ..........d{m^2}\)

\(490{m^2} = ..........d{m^2}\)

\(172d{m^2} = ..........c{m^2}\)

\(9657d{m^2} = .....{m^2}.....d{m^2}\)

\(9{m^2}3d{m^2} = ..........d{m^2}\)

\(4{m^2}25d{m^2} = ..........c{m^2}\)

\(39d{m^2}4c{m^2} = ..........c{m^2}\)

\(1{m^2}78d{m^2} = ..........c{m^2}\)

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Trả lời:

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Giải bởi Vietjack

Hướng Dẫn Giải

- \(9{m^2} = ..........d{m^2}\)

\(9{m^2} = 9 \times 100d{m^2} = 900d{m^2}\)

- \(490{m^2} = ..........d{m^2}\)

\(490{m^2} = 490 \times 100d{m^2} = 49000d{m^2}\)

- \(172{\rm{ d}}{{\rm{m}}^2} = ...{\rm{ c}}{{\rm{m}}^2}\)

\(172{\rm{ d}}{{\rm{m}}^2} = 172 \times 100{\rm{ c}}{{\rm{m}}^2} = 17200{\rm{ c}}{{\rm{m}}^2}\).

- \(9657{\rm{d}}{{\rm{m}}^2} = ...{\rm{ }}{{\rm{m}}^2}...{\rm{ d}}{{\rm{m}}^2}\)

\(9657{\rm{ d}}{{\rm{m}}^2} = 9600{\rm{d}}{{\rm{m}}^2} + 57{\rm{d}}{{\rm{m}}^2} = 9600:100{\rm{ }}{{\rm{m}}^2} + 57{\rm{d}}{{\rm{m}}^2} = 96{{\rm{m}}^2} + 57{\rm{d}}{{\rm{m}}^2}\)

\( = 96{{\rm{m}}^2}57{\rm{d}}{{\rm{m}}^2}\)

- \(9{{\rm{m}}^2}3{\rm{d}}{{\rm{m}}^2} = ..........{\rm{d}}{{\rm{m}}^2}\)

\(9{{\rm{m}}^2}3{\rm{d}}{{\rm{m}}^2} = 9{{\rm{m}}^2} + 3{\rm{d}}{{\rm{m}}^2} = 9 \times 100{\rm{d}}{{\rm{m}}^2} + 3{\rm{d}}{{\rm{m}}^2} = 900{\rm{d}}{{\rm{m}}^2} + 3{\rm{d}}{{\rm{m}}^2} = 903{\rm{d}}{{\rm{m}}^2}\)

- \(4{\rm{ }}{{\rm{m}}^2}25{\rm{ d}}{{\rm{m}}^2} = ...{\rm{ c}}{{\rm{m}}^2}\)

\(4{{\rm{m}}^2}25{\rm{d}}{{\rm{m}}^2} = 4{{\rm{m}}^2} + 25{\rm{d}}{{\rm{m}}^2} = 4 \times 10000{\rm{c}}{{\rm{m}}^2} + 25 \times 100{\rm{c}}{{\rm{m}}^2}\)

\( = 40000{\rm{c}}{{\rm{m}}^2} + 2500{\rm{c}}{{\rm{m}}^2} = 42500{\rm{c}}{{\rm{m}}^2}\)

- \(39{\rm{d}}{{\rm{m}}^2}4{\rm{ c}}{{\rm{m}}^2} = ...{\rm{c}}{{\rm{m}}^2}\)

\(39{\rm{d}}{{\rm{m}}^2}4{\rm{c}}{{\rm{m}}^2} = 39{\rm{d}}{{\rm{m}}^2} + 4{\rm{c}}{{\rm{m}}^2} = 39 \times 100{\rm{ c}}{{\rm{m}}^2} + 4{\rm{c}}{{\rm{m}}^2}\)

\( = 3900{\rm{c}}{{\rm{m}}^2} + 4{\rm{c}}{{\rm{m}}^2} = 3904{\rm{c}}{{\rm{m}}^2}\)

- \(1{{\rm{m}}^2}78{\rm{ d}}{{\rm{m}}^2} = ...{\rm{ c}}{{\rm{m}}^2}\)

\(1{{\rm{m}}^2}78{\rm{d}}{{\rm{m}}^2} = 1{{\rm{m}}^2} + 78{\rm{d}}{{\rm{m}}^2} = 1 \times 10000{\rm{c}}{{\rm{m}}^2} + 78 \times 100{\rm{c}}{{\rm{m}}^2}\)

\( = 10000{\rm{c}}{{\rm{m}}^2} + 7800{\rm{c}}{{\rm{m}}^2} = 17800{\rm{c}}{{\rm{m}}^2}\)

CÂU HỎI HOT CÙNG CHỦ ĐỀ

Lời giải

Chu vi khu đất của ông Tư là:

\((48 + 25) \times 2 = 146{\rm{ (m)}}\)

Do ông Tư chừa lối đi rộng 2m nên thực tế ông đã thuê rào số mét là:

\(146 - 2 = 144{\rm{ (m)}}\)

Đổi \(144{\rm{ m}} = 1440{\rm{ dm}}\).

Số tiền ông Tư phải trả là:

\(1440 \times 2500 = 3600000{\rm{ (d?ng)}}\)

Đáp Số: 3 600 000 (đồng)

Lời giải

Hướng Dẫn Giải

\(14{\rm{da}}{{\rm{m}}^2} = 14 \times 100{\rm{ }}{{\rm{m}}^2} = 1400{{\rm{m}}^2}\)

\(1700{{\rm{m}}^2} = 1700:100{\rm{ da}}{{\rm{m}}^2} = 17{\rm{da}}{{\rm{m}}^2}\)

\(16{\rm{da}}{{\rm{m}}^2}10{{\rm{m}}^2} = 16{\rm{da}}{{\rm{m}}^2} + 10{{\rm{m}}^2} = 16 \times 100{{\rm{m}}^2} + 10{{\rm{m}}^2} = 1610{{\rm{m}}^2}\)

\(37{\rm{da}}{{\rm{m}}^2}9{{\rm{m}}^2} = 37{\rm{da}}{{\rm{m}}^2} + 9{{\rm{m}}^2} = 37 \times 100{{\rm{m}}^2} + 9{{\rm{m}}^2} = 3709{{\rm{m}}^2}\)

\(1{{\rm{m}}^2} = 1:100{\rm{ da}}{{\rm{m}}^2} = \frac{1}{{100}}{\rm{ da}}{{\rm{m}}^2}({\rm{hay }}0,01{\rm{da}}{{\rm{m}}^2})\)

\(8{\rm{da}}{{\rm{m}}^2} = 8:100{\rm{h}}{{\rm{m}}^2} = \frac{8}{{100}}{\rm{h}}{{\rm{m}}^2}({\rm{hay }}0,08{\rm{h}}{{\rm{m}}^2})\)

\(26{{\rm{m}}^2} = 26:100{\rm{da}}{{\rm{m}}^2} = \frac{{26}}{{100}}{\rm{da}}{{\rm{m}}^2}({\rm{hay }}0,26{\rm{da}}{{\rm{m}}^2})\)

\(42{\rm{da}}{{\rm{m}}^2} = 42:100{\rm{h}}{{\rm{m}}^2} = \frac{{42}}{{100}}{\rm{ h}}{{\rm{m}}^2}({\rm{hay }}0,42{\rm{h}}{{\rm{m}}^2})\)

\(15{{\rm{m}}^2} = 15 \times 10000{\rm{c}}{{\rm{m}}^2} = 150000{\rm{ c}}{{\rm{m}}^2}\)

\(7{\rm{da}}{{\rm{m}}^2} = 7 \times 10000{\rm{d}}{{\rm{m}}^2} = 70000{\rm{d}}{{\rm{m}}^2}\).