tính nhanh
a] 435 * 25 + 76 * 435 - 435 b] 35 * 49 + 51 * 36
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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 - 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
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) 2459 - [ 400 + 459 ] = 2459 - 859 = 1600
b) 435 x 25 + 76 x 435 - 435 = 435 x ( 25 + 76 - 1 ) = 435 x 100 = 43500
c) 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
-HT-
a) 2459 - [400 + 459] b) Mk chịu c) 35 x 49 + 51 x 36
= [2459 - 459] + 400 = 35 x (49 + 51) x 36
= 2000 + 400 = 35 x 100 x 36
= 2400 = 3500 x 36
= 126000
435 x 25 + 76 x 435 - 435
= 435 x 25 + 76 x 435 - 435 x 1
= 435 x ( 25 + 76 - 1 )
= 435 x 100
= 43500
ai k mk mk k lai
435x25+76x435-435
=(25+76)x435-435
=101x435-435
=43935-435
=43500
a: \(-59+71-\left\{-83-\left(95\right)\right\}\)
\(=71-59+81+95\)
\(=12+81+95\)
\(=93+95=188\)
b: \(-257-\left\{\left(-257+156\right)-56\right\}\)
\(=-257-\left(-257+156-56\right)\)
\(=-257-\left(-257+100\right)\)
\(=-257+257-100=-100\)
c: Sửa đề:\(\left(435-167\right)-89-\left(435-89\right)\)
\(=435-167-89-435+89\)
=\(\left(435-435\right)+\left(-89+89\right)-167\)
=0+0-167
=-167
d: \(-329+\left(15-101\right)-\left(25-440\right)\)
\(=-329+15-101-25+440\)
\(=\left(440-329-101\right)+\left(15-25\right)\)
=10-10
=0
e: \(\left(116+124\right)+\left(215-116-124\right)\)
\(=116+124+215-116-124\)
\(=\left(116-116\right)+\left(124-124\right)+215\)
=0+0+215
=215
f: \(4524-\left(864-999\right)-\left(36-999\right)\)
\(=4524-864+999-36+999\)
\(=4524-\left(864+36\right)+999\cdot2\)
\(=4524-900+1998=5622\)
a) 1 3 + − 1 3 + 1 3 = 1 3
b ) − 1 3 + 2 5 + − 2 3 + 4 5 = 1 5 c ) 7 23 + 16 23 + − 5 9 + − 4 9 + − 5 8 = − 5 8 d ) − 2 9 + − 3 4 + − 1 36 + 1 3 + 3 5 + 1 5 = 0 e ) − 1 2 + − 1 9 + − 7 18 + 4 35 + 3 5 + 2 7 = 0
a, 435*25+76*435-435
=435*(25+76-1)
=435*100
=43500
b, 35*49+51*36
=35*49+51*(35+1)
=35*49+51*35+51
=35*(49+51)+51
=35*100+51
=3500+51
=3551
\(a,435\times25+76\times435-435\)
\(=435\times\left(25+76-1\right)\)
\(=435\times100\)
\(=43500\)
\(b,35\times49+51\times36\)
\(=1715+1836\)
\(=3551\)