数学题5题【5分】
1.(5.4X10∧11)÷(6X10∧5)2.8.56X10∧3-2.1X10∧33.(9X10∧5)X(2.5X10∧3)4.(3X103)∧35.(5.6X10∧7...
1.(5.4X10∧11)÷(6X10∧5)
2. 8.56X10∧3-2.1X10∧3
3. (9X10∧5)X(2.5X10∧3)
4. (3X103)∧3
5. (5.6X10∧7)÷(8X10∧3) 展开
2. 8.56X10∧3-2.1X10∧3
3. (9X10∧5)X(2.5X10∧3)
4. (3X103)∧3
5. (5.6X10∧7)÷(8X10∧3) 展开
2个回答
展开全部
1.(5.4X10∧11)÷(6X10∧5)
=5.4÷6×10^(11-5)
=0.9×10^6
=9×10^5
2. 8.56X10∧3-2.1X10∧3
=(8.56-2.1)×10^3
=6.46×10^3
3. (9X10∧5)X(2.5X10∧3)
=(9×5)×10^(5+3)
=45×10^8
=4.5×10^9
4. (3X100)∧3
=3^3×100^3
=271×0^6
=2.7×10^7
5. (5.6X10∧7)÷(8X10∧3)
=(5.6÷8)×10^(7-3)
=0.7×10^4
=7×10^3
=5.4÷6×10^(11-5)
=0.9×10^6
=9×10^5
2. 8.56X10∧3-2.1X10∧3
=(8.56-2.1)×10^3
=6.46×10^3
3. (9X10∧5)X(2.5X10∧3)
=(9×5)×10^(5+3)
=45×10^8
=4.5×10^9
4. (3X100)∧3
=3^3×100^3
=271×0^6
=2.7×10^7
5. (5.6X10∧7)÷(8X10∧3)
=(5.6÷8)×10^(7-3)
=0.7×10^4
=7×10^3
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