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\(\left(50\times18\right):9\\ 50\times18:9\\ =50\times\left(18:9\right)\\ =50\times2\\ =100\)
(72 x 135 + 9 x 28 x 15 ) : 25 - 3500 : 25
= ( 72 x 135 + 28 x 135 ) : 25 - 3500 : 25
= [ 135 x ( 72 + 28 ) ] : 25 - 3500 : 25
= ( 135 x 100 ) : 25 - 3500 : 25
= 13500 : 25 - 3500 : 25
= 25 x ( 13500 - 3500 )
=25 x 10000
= 250000
\(1235\text{×}6789\text{×}\left(630-315\text{×}2\right)\)
\(=1235\text{×}6789\text{×}\left(630-630\right)\)
\(=1235\text{×}6789\text{×}0=0\)
\(\left(100+67\right)\text{×}67+\left(200-38\right)\text{×}33\)
\(=167\text{×}67+167\text{×}33\)
\(=167\text{×}\left(67+33\right)\)
\(=167\text{×}100=16700\)
\(72+36\text{×}2+24\text{×}3+18\text{×}4+12\text{×}2+168\)
\(=72+72+72+72+24+168\)
\(=\left(72\text{×}4\right)+24+168=288+24+168=480\)
bn kia tính sai r kìa :vv
cách THCS:
\(\frac{2\times3\times6\times7}{2\times7\times18}=\frac{1\times1\times1\times1}{1\times1\times1}=1\)
Hướng dẫn giải:
a.
17 x 543 + 83 x 543
= (17 + 83) x 543
= 100 x 543
= 54300
b.
318 x 963 + 682 x 963
= (318 + 682) x 963
= 1000 x 963
= 963000
a)17x543+83x543
=(17+83)x543
=100x543
=54300
b)318x963+682x963
=(318+682)x963
=1000x963
=963000
( 18 x 83 + 9 x 17 x 2 - 3 x 60 x 6 ) : 72 = ( 18 x 83 + 18 x 17 - 18 x 60 ) : 72
= [ 18 x ( 83 + 17 - 60 ) ] : 72
= ( 18 x 40 ) : 72
= 720 : 72
= 10
(18.83+9.2.17-3.6.60):72
=(18.83+18.17-18.60):72
=18.(83+17-60):72
=18.40:72
=720:72
=10