Question

Câu 11 : TÍNH NHANH

4x126x25 

(9x8-12-5x12) x (1+2+3+4+5)

Answer 1

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Answer 2

\(4\times126\times25\\ =\left(4\times25\right)\times126\\ =100\times126\\ =12600\)

\(\left(9\times8-12-5\times12\right)\times\left(1+2+3+4+5\right)\\ =\left(72-12-60\right)\times15\\ =\left(60-60\right)\times15\\ =0\times15\\ =0\)

Answer 3

\(4\times126\times25=\left(4\times25\right)\times126=100\times126=12600\\ \left(9\times8-12-5\times12\right)\times\left(1+2+3+4+5\right)\\ =\left(3\times3\times2\times4-12-5\times12\right)\times\left(1+2+3+4+5\right)\\ =\left(12\times6-12-5\times12\right)\times\left(1+2+3+4+5\right)\\ =\left[12\times\left(6-1-5\right)\right]\times\left(1+2+3+4+5\right)\\ =\left(12\times0\right)\times\left(1+2+3+4+5\right)\\ =0\times\left(1+2+3+4+5\right)=0\)

Answer 4

\(4\times126\times25\)
\(=\left(4\times25\right)\times126\)
\(=100\times126\)
\(=12600\)
\(--------\)
\(\left(9\times8-12-5\times12\right)\times\left(1+2+3+4+5\right)\)
\(=\left(72-12-60\right)\times\left(1+2+3+4+5\right)\)
\(=0\times\left(1+2+3+4+5\right)\)
\(=0\)

Answer 5

4 x 126 x 25

=(4 x 25 ) x 26

= 100 x 26

=12600

(9 x 8 - 12 - 5 x 12) x ( 1+ 2 + 3 + 4+5)

=(72 - 12 - 60) x 15

= (60 - 60) x 15

=0 x 15

=0