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A. 234 x ( 1257 – 257 ) = 234 x 1257 - 234 x 257
B. 135 x 80 + 20 x 135 = 135 x ( 80 + 20 )
\(\left(366+434\right)\times\frac{1009}{500}+\frac{1009}{500}\times199+\frac{1009}{500}\)
\(=800\times\frac{1009}{500}+\frac{1009}{500}\times199+\frac{1009}{500}\)
\(=\left(800+199+1\right)\times\frac{1009}{500}\)
\(=1000\times\frac{1009}{500}\)
\(=2018\)
~ Thiên Mã ~
\(\left(366+434\right)\times\frac{1009}{500}+\frac{1009}{500}\times199+\frac{1009}{500}\)
\(=800\times\frac{1009}{500}+\frac{1009}{500}\times199+\frac{1009}{500}\times1\)
\(=\left(800+199+1\right)\times\frac{1009}{500}\)
\(=1000\times\frac{1009}{500}\)
\(=\frac{1009000}{500}=2018\)
Hướng dẫn giải:
6000 + 3000 + 1000 = 10 000
56 000 : 7 = 8000
5000 x 3 = 15 000
9000 – 7000 – 2000 = 0
a: =234x(45+54+1)
=234x100
=23400
b: =(8x125)x(50x20)
=1000x1000
=1000000
a = 243x(45+54+1)
=243 x 100
=24300
b = (20 x 50 ) x (8x125)
=1000x1000
=1000000
a,234.4+234.5+234=234(4+5+1)=234.10=2340
b,135.16-135.2-135.4=135(16-4-2)=135.10=1350
c,1/2+1/4+1/8+1/16+1/32+1/64=1-1/2+1/2-1/4+1/4-1/8+1/8-1/16+1/16-1/32=1-1/32=31/32
a) 234 x4 + 234 x 5 + 234 = 234 x ( 1+4+5)=2340
b)135 x16 -135 x2 -4 x135 =135 x (16-2-4) =1350
a) x= 0.2 = 1/5
b) x=2
a) 2009 : x -1009 : x = 5000
(2009 -1009) : x = 5000
1000 : x = 5000
x = 1/5.
b) 234 * x + 766 * x = 2000
( 234 + 766 ) * x = 2000
1000 * x = 2000
x = 2