72 + 36 * 2 + 24 * 3 + 18 * 4 + 12 + 6 + 168
72+36*2+24*3+18*4+12*6+168
72+36*2+24*3+18*4+12*6+168
=72+72+72+72+72+168
=72*5+168
=360+168
=528
72+72+72+72+72+168=72*5+168=360+168=528
72 + 36 x2 + 24 x 3 + 18 x 4 + 12 x 6 + 168
72 + 36 x 2 + 24 x 3 + 18 x 4 + 12 x 6 + 168
= 72 + 72 + 72 + 72 + 72 + 168
= 72 x 5 + 168
= 360 + 168
= 528
72 + 36 x2 + 24 x 3 + 18 x 4 + 12 x 6 + 168
72 + 36 x 2 + 24 x 3 + 18 x 4 + 12 x 6 + 168 / 2 + 2 + 4 + 6 + 10 + ...+ 68
Tinh nhanh:
\(\frac{\text{72+36*2+24*3+18*4+12*6+168}}{\text{2+2+4+6+10+16+26+42+68}}\)
\(\frac{72+36\times2+24\times3+18\times4+12\times2+168}{2+2+4+6+10+..................+68}\)
72+38*2+24*3+18*4+12*6+168
\(\frac{72+36\times2+24\times3+18\times4+12\times6+168}{2+2+4+6+...+512+1024}\)
Các bạn giúp mình và ghi đầy đủ cách giải nhé !
tính bằng cách thuận tiện nhất
1235 x 6789 x ( 630 - 315 x 2 )
( 100 + 67 ) x 67 + ( 200 - 33 ) x 33
72 + 36 x 2 + 24 x 3 + 18 x 4 +12 x 2 +168
\(1235\text{×}6789\text{×}\left(630-315\text{×}2\right)\)
\(=1235\text{×}6789\text{×}\left(630-630\right)\)
\(=1235\text{×}6789\text{×}0=0\)
\(\left(100+67\right)\text{×}67+\left(200-38\right)\text{×}33\)
\(=167\text{×}67+167\text{×}33\)
\(=167\text{×}\left(67+33\right)\)
\(=167\text{×}100=16700\)
\(72+36\text{×}2+24\text{×}3+18\text{×}4+12\text{×}2+168\)
\(=72+72+72+72+24+168\)
\(=\left(72\text{×}4\right)+24+168=288+24+168=480\)
a) \(1235\times6789\times\left(630-630\right)\)
\(=1235\times6789\times0\)
\(=1235\times0\)
\(=0\)
b) \(167\times67+167\times33\)
\(=167\times\left(67+33\right)\)
\(=167\times100\)
=16700