\(0,18\text{×}1230+0,9\text{×}1567\text{×}2-3\text{×}690\\ =221,4+2820,6-2070=1015\)

lớp 3 đã học đâu

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kết quả bằng 0 nhk

Nguyễn Ngọc Khánh Triều

Gọi tổng này là A . Cậu thấy có chữ số 0 ở dòng cuối cùng ak

Vậy ta có phép tính

= A . 0

= 0 

10 778 nha

TL:

= 10 778 

H

giúp mik đi mà

bằng 1521 nha !

k nè

=1521

56 + 1465 

= 1521

a) 46 874 – x = 1465

x = 46 874 – 1465

x = 45409

b) x - 1489 = 74 660

x = 74 660+1489

x = 76149

    \(500-\left\{5\left[409-\left(2^3\cdot3-21\right)^2+10^3\right]\right\}:15\)
\(=500-\left\{5\left[409-9+1000\right]\right\}:15\)
\(=500-\left\{5\cdot1400\right\}:15\)
\(=500-7000:15\)
\(=500-\dfrac{1400}{3}\)
\(=\dfrac{100}{3}\)



    \(67-\left[8+7\cdot3^2-24:6+\left(9-7\right)^2\right]:15\)
\(=67-\left[8+7\cdot9-24:6+4\right]:15\)
\(=67-\left[8+63-4+4\right]:15\)
\(=67-71:15\)
\(=67-\dfrac{71}{15}\)
\(=\dfrac{934}{15}\)

\(PeaGea\)

(x+2988)x2-1567 =4435

(x+2988)x2=4435+1567

(x+2988)x2=6002

x+2988=6002:2

x+2988=3001

x=3001-2988

x=13

(x + 2988) x 2 - 1567 = 4435  

(4435+1567):2=x+2988

6002:2=x+2988

3001=x+2988

x=3001-2988

x=13

(x + 2988) x 2 - 1567 = 4435  

(4435+1567):2=x+2988

6002:2=x+2988

3001=x+2988

x=3001-2988

x=13

Chọn B