Question

tính nhanh

4 mũ 2 nhân 120 - 4 mũ 3 nhân 17 + 4 mũ 2 nhân 34

7 mũ 3 nhân 9 + 3 mũ 2 nhân 7 mũ 4 - 45 nhân 539

5 nhân 10 mũ 4 + 4 nhân 10 mũ 3 + 6 nhân 10 mũ 2 + 5 nhân 10 + 9

Answer 1

\(4^2\cdot120-4^3\cdot17+4^2\cdot34\)

\(=4^2\left(120-4\cdot17+34\right)\)

\(=16\left(120-68+34\right)\)

\(=16\cdot86=1088\)

Answer 2

\(7^3\cdot9+3^2\cdot7^4-45\cdot539\)

\(=7^3\cdot9+9\cdot7^4-45\cdot7^2\cdot11\)

\(=7^2\left(7\cdot9+9\cdot7^2-45\cdot11\right)\)

\(=49\left(63+9\cdot49-495\right)\)

\(=49\left(63+441-495\right)\)

\(=49\cdot9=441\)

Answer 3

\(5\cdot10^4+4\cdot10^3+6\cdot10^2+5\cdot10+9\)

\(=10\left(5\cdot10^3+4\cdot10^2+10\cdot6\right)+9\)

\(=10\left(5\cdot1000+4\cdot100+60\right)+9\)

\(=10\left(5000+400+60\right)+9\)

\(=10\cdot5460+9=54600+9=54609\)

Answer 4

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