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a) 2 x 12 x 43 + 3 x 32 x 8 + 25 x 6 x4
=(2 x12) x43+(3 x8) x32+(6 x4) x25
=24 x43+24 x32+ 24 x25
=24 x(43+32+25)
=24 x100
=2400
b) 78 x 31 + 78 x 24 + 17 x 78 + 28 x 78
=78x(31+24+17+28)
=78x100
=7800
hihi mk giải được 1 đề sau thôi
78x32+78x24+78x17+22x72=78x(32+24+17) +22x72
=78x73+22x72
=5694+1584
=7278
78x31+78x24+78x17+22x72
=>78x(31+24+17)+22x72
=>78x72+22x72
=>72x(78+22)
=>72x100
=>7200
t nha
12 . 53 + 53 . 16 + 28 . 47
= 53 . ( 12 + 16 ) + 28 . 47
= 53 . 28 + 28 .47
= ( 53 + 47 ) . 48
= 100 . 48
= 4800
78 . 31 . 78 . 24 + 78 . 17 + 22 . 72
= 78 . ( 31 + 24 + 17 ) + 22 . 72
= 78 . 72 + 22 . 72
= ( 78 + 22 ) . 72
= 100 . 72
= 7200
32 x 125 x 3
= 8 . 4 + 125 . 3
= ( 125 . 8 ) . ( 4 . 3 )
= 1000 . 12
= 12000
\(\frac{\left(120+60\right)}{12}=\frac{120}{12}+\frac{60}{12}=10+5=15\)
\(78\cdot31+78\cdot17+78\cdot24+22\cdot72=78\left(31+17+24\right)+22\cdot72\)
\(=78\cdot72+22\cdot72=72\left(78+22\right)=72\cdot100=7200\)
\(997+86=997+\left(83+3\right)=\left(997+3\right)+83\)
\(=1000+83=1083\)
\(5\cdot25\cdot2\cdot37\cdot4=\left(5\cdot2\right)\cdot\left(25\cdot4\right)\cdot37\)
\(=10\cdot100\cdot37=37000\)
\(558+336+442+664=\left(558+442\right)+\left(336+664\right)\)
\(=1000+1000=2000\)
5 x 25 x 2 x 37 x 4
= ( 5 x 2 ) x ( 25 x 4 ) x 37
= 10 x 100 x 37
= 1000 x 37
= 37000
a. 38,42 + 19,5 + 61,58 + 80,5 = ( 38,42 + 61,58 ) + ( 19,5 + 80,5 )
= 100 + 100
= 200
b. 50 x 7,32 x 2 = ( 50 x 2 ) x 7,32 )
= 100 x 7,32
= 732
c.125,7 x 22 + 125,7 x 78 = 125,7 x ( 22 + 78 )
= 125,7 x 100
= 12570
d, 3,4 x 1,1 + 6,6 x 1,1 = ( 3,4 + 6,6 ) x 1,1
= 10 x 1,1
= 11
a. = (38,42 + 61,85 ) + (19,5 + 80,5 )
= 100,27 + 100
= 200,27
b. = (50 ×2) ×7,32
= 100 × 7,32
= 732
c.= 125,7 × (22 + 78)
= 125,7 × 100
= 12570
d. = 1,1 × (3,4 + 6,6 )
= 1,1 × 10
= 11
\(78\cdot15-\frac{28}{50}+78\cdot14\)
\(=78\cdot\left(15-14\right)+\frac{14}{25}\)
\(=78\cdot1+\frac{14}{25}\)
\(=78+\frac{14}{25}=78\frac{14}{25}\)
\(78\times15-\frac{28}{50}+78\times14.\)
\(=78\times\left(15+14\right)-\frac{28}{50}\)
\(=78\times29-\frac{28}{50}\)
\(=2262-\frac{28}{50}\)
\(=\frac{56536}{25}\)