Giúp em : 1465 +x :7 = 1567
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\(0,18\text{×}1230+0,9\text{×}1567\text{×}2-3\text{×}690\\ =221,4+2820,6-2070=1015\)
lớp 3 đã học đâu
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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:7=1567-1465
x:7=102
x=102:7
x=14
1456 + x = 1567 x 7
1456 + x = 10969
x = 10969 - 1456
x = 9513