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35 \(\times\) 49 + 51 \(\times\) 36
= 35 \(\times\) 49 + 51 \(\)\(\times\) (35 + 1)
= 35 \(\times\) 49 + 35 \(\times\) 51 + 51
= (35 \(\times\) 49 + 35 \(\times\) 51) + 51
= 35 \(\times\)( 49 + 51) + 51
= 35 \(\times\) 100 + 51
= 3500 + 51
= 3551
a) \(\text{2459 - (400 + 459)}\)
\(\text{= 2459 - 859}\)
\(\text{= 1600}\)
b) \(435\times25+76\times435-435\)
\(=435\times\left(25+76-1\right)\)
\(=435\times100\)
\(=43500\)
c) \(35\times49+51\times36\)
\(=35\times49+51\times\left(35+1\right)\)
\(=35\times49+51\times35+51\)
\(=35\times\left(49+51\right)+51\)
\(=35\times100+51\)
\(=3500+51\)
\(=3551\)
a) 2459 - (400 + 459)
= 2459 - 400 - 459
= (2459 - 459) - 400
= 2400 - 400
= 2000
b) 435 x 25 + 76 x 435 - 435
= 435 x (25 + 76 - 1)
= 435 x 100
= 43500
c) 35 x 49 + 51 x 36
= 1715 + 1836
= 3551
a) 2459 - ( 400 + 459 )
= ( 2459 - 459 ) - 400
= 2000 - 400
= 1600
b) 435 x 25 + 75 x 435
= 435 x ( 75 + 25 )
= 435 x 100
= 43 500
c) 35 x 49 + 51 x 35
= 35 x ( 49 + 51 )
= 35 x 100
= 3500
(a +b – 1) x (a +b -2 ) x.. x… x (a +b -100)
=(49 +51 – 1) x (49 +51 -2 ) x.. x… x (49 +51 -100)
=(49 +51 – 1) x (49 +51 -2 ) x.. x… x (100-100)
=(49 +51 – 1) x (49 +51 -2 ) x.. x… x 0 =0
๛нỌ¢ тỐтツ nha em
a) 2459 - ( 400 + 459 )
= 2459 - 400 - 459
= 2000 - 400
= 1600
b) 435 x 25 +76 x 435 - 435
= 435 x 25 + 76 x 435 - 435 x 1
= 435 ( 25 + 76 - 1 )
= 435 x 100
= 43500
c) 36 x 49 + 51 x 36
= 36 ( 49 + 51 )
= 36 x 100
= 3600
Bài 1: Tính nhanh
A, 13 x 126 + 37 x 126 - 49 x 126
= 126 x ( 13 + 49 - 49 )
= 126 x 1
= 126
B, ( 1 + 2 + 4 + 8+.....+ 512 ) x ( 101 x 102 - 101 x 101 - 50 - 51 )
= ( 1 + 2 + 4 + 8+.....+ 512 ) x ( 101 x ( 102 - 101 - 1))
= ( 1 + 2 + 4 + 8+.....+ 512 ) x ( 101 x 0)
= ( 1 + 2 + 4 + 8+.....+ 512 ) x 0
= 0
35 x 49 + 51 x 36 = 35 x 49 + 51 x ( 35+1) =35 x 49 + 51 x 35 + 51 = 35 x ( 49 + 51 ) + 51 = 35 x 100 + 51 = 3500+51 = 3551
=(36-1)x49+51x36
=36x49-1x49+51x36
=36x49-49+51x36
=36x(49+51)-49
=36x100-49
=3600-49
=3551