PBT cuoi thang 9 rat hay

Chia sẻ bởi Đậu Thị Thanh Hoan | Ngày 09/10/2018 | 30

Chia sẻ tài liệu: PBT cuoi thang 9 rat hay thuộc Toán học 3

Nội dung tài liệu:

Thứ hai ngày 27 tháng 9 năm 2010
A. Dạng 1: Tính nhanh ( Rút thừa số chung)
* 24 x 5 + 24 x 3 + 24 x 2
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* 24 x 5 + 24 x 4 + 24
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* 217 x 45 + 50 x 217 + 207 x 5
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* 456 x 36 + 456 x 61 + 4 x 456 + 456
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* (16 x 6+ 16 x3 + 16) - (12 x 65 + 12 x 3 + 2 x12)
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* (16 x 6+ 16 x3 + 16) - 12 x 65 - 12 x 3 - 2 x12
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* 213 x 37 + 213 x 39 + 23 x 213 + 213
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* 9 + 9 x 3 + 18 : 2 x 6
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* 2007 x 16 - 2007 x 14 - 2007 x 2 + 2007
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* 3 x 9 + 18 x 2 + 2 x 9 + 9
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* ( 145 x 99 + 145) - ( 143 x 101 - 143 )
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* 2006 x ( 43 x 10 - 2 x 43 x 5) + 100
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* 64 x 4 + 18 x 4 + 9 x 8
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* 44 x 5 + 18 x 10 + 20 x 5
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* 3 x 4 + 4 x 6 + 9 x 2 + 18
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* 2 x 5 + 5 x 7 + 9 x 3
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* 15 : 5 + 27 : 5 + 8 : 5
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* 99 : 5 - 26 : 5 - 14 : 5
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B. Dạng 2: Tính nhanh ( Một vế bằng không)
* ( 18 - 9 x 2) x ( 2 + 4 + 6 + 8 + 10 )
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* ( 7 x 8 - 56 ) : ( ...............................)
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* ( ....................................) x ( 42 - 6 x 7 )
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*( 12 x 6 - 12 x 4 - 12 x 2 ) x ( ...................................)
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*(a x 7 + a x 8 - a x 15) : ( 1 + 2 + 3 + ........ + 10)
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*58 - 58 x( 6 + 54 - 60)
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* 32 + 63 x a x ( a x 1 - a : 1) + 32 x 8 + 32
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* ( 1 + 2 + 3 + 4 + .... + 9 ) x ( 21 x 5 - 21 - 4 x21)
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* ( 9 x 7 + 8 x 9 - 15 x 9 ) : ( 1 + 3 + 5 + 7 + ........+ 17 + 19 )
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( 2 + 4 + 6 + 8 + ... + 20 ) x ( 56 x 3 - 72 : 9 x 21)
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BTVN( làm vở ô ly , bài nào khó giờ sau chữa bài)
Tính bằng cách hợp lý
a, 874 - 504 – 370 =
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b, 70 – 10 – 10 -10 -10 -10 =
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c, a + a + a + a – 4 x a =
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d) 178 + 284 + 370 - 84 - 78 - 70
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e) 2 + 4 + 6 + 8 + 10 + ……..+ 38 + 40
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2. Phong cao 125 cm, Thắng cao 107 cm
a. Đặt câu hỏi cho bài toán ( bằng 3 cách ) để bài toán giải bằng một phép tính rồi giải.
b.Trong 3 câu hỏi em vừa đặt, em thấy câu hỏi nào không phù hợp trong thực tế?
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2.Tính




a, Chu vi hình chữ nhật AMND và hình chữ nhật MBCN bằng cách nhanh nhất?
b, Hãy so sánh tổng chu vi hai hình chữ nhật trên với chu vi hình chữ nhật ABCD
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4 Điền số thích hợp vào các ô trống sao cho tổng của 3 số ở 3 ô liền nhau đều bằng 692. Giải thích cách điền?

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Bài 2: Tìm x: a) x  8 + 25 = 81 b) 72 - x : 4 = 16 c) 678 – x - 67
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