Toán Lớp 7: Tính nhanh:
25.6 + 5.5.29 – 45.5
2.[(7 – 33:32):22 + 99] – 100
(72022 – 72021):72021
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Toán Lớp 7: Tính nhanh:
25.6 + 5.5.29 – 45.5
2.[(7 – 33:32):22 + 99] – 100
(72022 – 72021):72021
Comments ( 1 )
=25.6+25.29-9.5.5
=25.6+25.29-9.25
=25(6+29-9)
=25. 26
=650
=2.[(7 – 3^[3-2]):4 + 99] – 100
=2.[(7 – 3^1):4 + 99] – 100
=2.[(7 – 3):4 + 99] – 100
=2.[4:4 + 99] – 100
=2.[1+ 99] – 100
=2.100 – 100
=200-100
=100
=(7^[2022]:7^[2021])-(7^[2021]:7^[2021])
=7^[2022-2021]-7^[2021-2021]
=7^1-7^0
=7-1
=6