Tính bằng cách thuận tiện nhất:
752 x 89 - 752 x 9 + 752 x 20
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a) \(39\times118+29\times82\)
\(=39\times2\times59+29\times2\times41\)
\(=2\times\left(39\times59+29\times41\right)\)
\(=2\times\left(2301+1189\right)\)
\(=2\times3490\)
\(=6980\)
b) \(37\times39+78\times14-13\times85-52\times55\)
\(=37\times3\times13+6\times13\times14+13\times85-4\times13\times55\)
\(=13\times\left(37\times3+6\times14+85-4\times55\right)\)
\(=13\times\left(111+84+85-220\right)\)
\(=13\times\left(280-220\right)\)
\(=13\times60\)
\(=780\)
c) \(368:16+752:16+480:16\)
\(=\left(368+752+480\right):16\)
\(=\left(1120+480\right):16\)
\(=1600:16\)
\(=100\)
d) \(5\times11\times18+9\times31\times10+4\times29\times45\)
\(=5\times11\times9\times2+9\times31\times10+2\times2\times29\times5\times9\)
\(=10\times9\times11+10\times9\times31+10\times29\times2\times9\)
\(=90\times11+90\times31+90\times29\times2\)
\(=90\times\left(11+31+29\times2\right)\)
\(=90\times\left(42+58\right)\)
\(=90\times100\)
\(=9000\)
x + 256 = 300
x = 300 -256
x = 44
x + 752 = 800
x = 800 - 752
x = 48
x - 800 = 100
x = 100 + 800
x = 900.
x + 256 = 300
x = 300 - 256
x = 44
x + 752 = 800
x = 800 - 752
x = 48
x - 800 = 100
x = 100 + 800
x = 900
\(\dfrac{45}{100}+\dfrac{9}{20}\times29+45\%\times30\) + 0,9 \(\times\) 20
= \(\dfrac{9}{20}\) + \(\dfrac{9}{20}\times29\) + \(\dfrac{9}{20}\) \(\times\) 30 + 18
= \(\dfrac{9}{20}\) \(\times\) ( 1 + 29 + 30) + 18
= \(\dfrac{9}{20}\) \(\times\) 60 + 18
= 27 + 18
= 45
752x89-752x9+752x20
=752x(89-9+20)
=752x100
=75200
752 x 89 - 752 x 9 + 752 x 20
= 752 x ( 89 - 9 + 20 )
= 752 x ( 80 + 20 )
= 752 x 100
= 75200