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a, 4 x 113 x 8 - 32 x 13
= (4 x 8) x 113 - 32 x 13
= 32 x 113 - 32 x 13
= 32 x (113 - 13)
= 32 x 100 = 3200
b , 54 x 227 + 45 x 227 + 227
= 227 x (54+45+1)
= 227 x 100
= 22 700
c, ( 145 x 99 + 145 ) - ( 143 x101 - 143 )
= 145 x (99+1) - 143 x (101 - 1)
= 145 x 100 - 143 x 100
= 100 x (145 - 143)
= 100 x 2
= 200
a) \(4\times113\times8-32\times13\)
\(=4\times8\times113-32\times13\)
\(=32\times113-32\times13\)
\(=32\times\left(113-13\right)\)
\(=32\times100\)
\(=3200\)
b) \(54\times227+45\times227+227\)
\(=227\times\left(54+45+1\right)\)
\(=227\times100\)
\(=22700\)
c) \(\left(145\times99+145\right)-\left(143\times101-143\right)\)
\(=145\times\left(99+1\right)-143\left(101-1\right)\)
\(=145\times100-143\times100\)
\(=14500-14300\)
\(=200\)
2 - ( 2/8 + x - 173/24 ) : 50/3 = 0
( 2/8 + x - 173/24 ) : 50/3 = 2 - 0
( 2/8 + x - 173/24 ) : 50/3 = 2
2/8 + x - 173/24 = 2 x 50/3
2/8 + x - 173/24 = 100/3
2/8 + x = 100/3 + 173/24
2/8 + x = 973/24
x = 973/24 - 2/8
x = 967/24
\(2-\left(\frac{2}{8}+x-\frac{173}{24}\right)\text{ : }\frac{50}{3}=0\)
\(2-\left(\frac{2}{8}+x-\frac{173}{24}\right)=0\text{ x }\frac{50}{3}\)
\(2-\left(\frac{2}{8}+x-\frac{173}{24}\right)=0\)
\(\frac{2}{8}+x-\frac{173}{24}=2-0\)
\(\frac{2}{8}+x-\frac{173}{24}=2\)
\(\frac{2}{8}+x=2+\frac{173}{24}=\frac{48}{24}+\frac{173}{24}\)
\(\frac{2}{8}+x=\frac{221}{24}\)
\(x=\frac{221}{24}-\frac{2}{8}=\frac{221}{24}-\frac{6}{24}\)
\(x=\frac{215}{24}\)
`a) 162+275+173+227+725+438`
`=(162+438)+(275+725)+(173+227)`
`=600+1000+400`
`=(600+400)+1000`
`=1000+1000=2000`
a) 39,66 x 43 + 171 x 13,22
= 39,66 x 43 + 57 x 3 x 13,22
= 39,66 x 43 + 57 x 39,66
= 39,66 x (43 + 57) = 39,66 x 100 = 3966.
Bài 1.
\(x\times15+x\times35=250\)
\(x\times\left(15+35\right)=250\)
\(x\times50=250\)
\(x=250:50\)
\(x=5\)
\(------\)
\(718-x\times5=173\)
\(x\times5=718-173\)
\(x\times5=545\)
\(x=545:5\)
\(x=109\)
1:
=14,445*10=144,45
2:
=3016(2*97+1+2)=197*3016=594152
2,168,800.
5423 x 227 +2146 x 173 + 173 x 3277
= 5423 x 227 + (2146 x 173 + 173 x 3277)
= 5423 x 227 + 173 x (2146 + 3277)
= 5423 x 227 + 173 x 5423
= 5423 x (227 + 173)
= 5423 x 400
= 2169200