15 x 26 + 15 x 74
1. Tinh
39 x 148 + 15 x (-74) -48 x 39 + (-15) x 26
(-78) : 6 + (-345) : (-15)
(-3) x { 48 - [ 27 + 4 x (-3)2 ] }
2. Tim x
( x - 2)2 + 16 = 32
( x + 3 )2 + 25 = -56
Bài tinh thi các bạn tinh nhanh hộ minh
120 - ( 74 - ( 15 - 123 ) )
43 x 29 - 43 x 26
73 x 124 + 76 x 27
18 x 181 + 18 x 19 - 138
a, 12 + 126 + 42 + 74 + 158 + 88
b, 15 x 23 + 15 x 56 + 15 x 21
mình cần gấp nx please !!!
a, `12 + 126 + 42 + 74 + 158 + 88`
`= (12+88)+(126+74)+(42+158)`
`=100+200+200`
`=500`
b, `15xx23+15xx56+15xx21`
`=15xx(23+56+21)`
`=15xx100`
`=1500`
Tìm x biết: x ÷ 2 + 15 = 74
A. 168
B. 108
C. 118
D. 178
(x+5)+(x+10)+(x+15)+(x+20)=74
x = (74-5-10-15-20):4(vì có 4 x)=6
x=6
(x+5) +(x+10) +(x+15)+(x+20)=74
(\(x\) + 5) + (\(x\) + 10) + (\(x\) + 15) + (\(x\) + 20) = 74
\(x\) + 5 + \(x\) + 10 + \(x\) + 15 + \(x\) + 20 = 74
(\(x\) + \(x\) + \(x\) + \(x\)) + (5 + 10 + 15 + 20) = 74
4\(x\) + 50 = 74
4\(x\) = 74 - 50
4\(x\) = 24
\(x\) = 24: 4
\(x\) = 6
( x + 5 ) + ( x + 10 ) + ( x + 15 ) + ( x + 20 ) = 74
X x 4+ ( 5+10+15+20) = 74
X x 4 + 50 = 74
X x 4 = 74-50
X x 4 = 24
X = 24:4 = 6
(x+5)+(x+10)+(x+15)+(x+20)=74
(x+5)+(x+10)+(x+15)+(x+20)=74
4x+50=74
4x=74-50
4x=24
x=24:4
x=6
[ x +5 ] + [ x + 10 ] + [x +15 ] + [ x + 20 ] = 74