\(8.3=???\)
8.3*6.9+8.3+2.1*8.3
8.3*6.9+8.3+2.1*8.3
8.3 - ( 110 + 15 ) : 16
d.(8.3-21)2
Tính nhanh: 37.7 + 7.63 – 8.3 – 3.2
A. 700
B. 620
C. 640
D. 670
37.7 + 7.63 – 8.3 – 3.2 = (37.3 + 7.63) – (8.3 + 3.2)
= 7(37 + 63) – 3(8 + 2) = 7.100 – 3.10
= 700 – 30 = 670
Đáp án cần chọn là: D
5.3^x =8.3^10-3.3^10
5.3x = 8.310 - 3.310
<=> 5.3x = ( 8-3 ) . 310
<=> 5.3x = 5 .310
<=> x = 10
480:[75+(72- 8.3):5]+2021
Lời giải:
$480:[75+(7^2-8.3):5]+2021=480:(75+25:5)+2021$
$=480:(75+5)+2021=480:80+2021=6+2021=2027$
\(480:\left[75+\left(7^2-8.3\right):5\right]+2021=480:\left[75+\left(49-24\right):5\right]+2021=480:\left[75+25:5\right]+2021=480:\left[75+5\right]+2021=480:80+2021=6+2021=2027\)
480:[75+(7²-8.3):5]+2021⁰
=480:[75+(49-8.3):5]+1
=480:[75+(49-24):5]+1
=480:[75+25:5]+1
=480:[75+5]+1
=480:80+1
=6+1
=7
tinh : 3:4.5+7-8.3
3 : 4 . 5 + 7 - 8 . 3
= 0,75 .5 + 7 - 8 . 3
= 3,75 + 7 - 24
= 10,75 - 24
= - 13,25
hok tốt nha
476-{5.[409-(8.3-21^2)]-1724}