75+791+125+1009/631-173+169-127 = ?
Tính bằng cách thuận tiện nhất 125+173+175+27 125 x 75 + 125 x 25 =???? Giúp em mik đi
\(125+173+175+27=\left(125+175\right)+\left(173+27\right)=300+200=500\)
\(125\times75+125\times25=125\times\left(75+25\right)=125\times100=12500\)
125 + 173 + 175 + 27 = ( 125 + 175 ) + ( 173 + 27 ) = 300 + 200 = 500
125 × 75 + 125 × 25 = 125 × ( 75 + 25 ) = 125 × 100 = 12500
a)\(\left(-3\right).8.\left(-2\right).5=\left(-3\right).\left(-2\right).8.5\)
\(=6.40=240\)
b)\(127-18.\left(5+6\right)=127-18.11\)
\(=127-198=-71\)
c)\(125-\left(-75\right)+32-\left(48+32\right)=125+75+32-48-32\)
\(\left(125+75\right)+\left(32-32\right)-48=200-48=152\)
d)\(3.\left(-4\right).2+2.\left(-5\right)-20=-12.2+2.\left(-5\right)-20\)
\(=\left(-12-5\right).2-20=-17.2-20=-140-20=-160\)
Chúc bạn học tốt
Tinh nhanh
a)1272+146*127+732
b)98*28-(184-1)(184+1)
c)1002-992+982-972+...+22-12
d)(180^2-220^2)/125^2+150*125+75^2
Tính bằng cách thuận tiện
(122/122×123/125+127/129)×(1995/1996×17/121/25÷16/17)×(42/30×75/23_19/23×210/38
(121/122 x 123/125 +127/129) x (1995/1996 x 17/16 - 21/25:16/17) x (42/30 x 75/23 - 19/23 x 210/38) =?
minh cung dang thac mac cau nay ban nao giup minh voi
Tính nhanh
( 1+3+5+7+…+2003+2005) x (125 125 x 127 – 127 127 x 125)
( 1+3+5+7+…+2003+2005) x (125 125 x 127 – 127 127 x 125)
= ( 1+3+5+7+…+2003+2005) x (125 x 1001 x 127 – 127 x 1001x 125)
= ( 1+3+5+7+…+2003+2005) x 0 = 0
Tính nhanh
( 121/122 x 123/125 + 127/129) x ( 1995/1996 x 17/16 - 21/25 : 16/17 ) x ( 42/30 x 75/23 - 19/23 x 210/38)
Bài gì mà lộn xộn vậy trời . Không hiểu gì luôn .
Tính nhanh:
a. ( 1+3+5+7+…+2003+2005) x (125 125 x 127 – 127 127 x 125)
b. 19 , 8 : 0 , 2 x 44 , 44 x 2 x 13 , 2 : 0 , 25 3 , 3 x 88 , 88 : 0 , 5 x 6 , 6 : 0 , 125 x 5
a. Vì 125 125x127 – 127 127x125 = 1001x125x127 – 1001x127x125 = 0
nên : (1+3+5+...+2005)(125 125x127 – 127 127x125) = 0
b.
19 , 8 : 0 , 2 x 44 , 44 x 2 x 13 , 2 : 0 , 25 3 , 3 x 88 , 88 : 0 , 5 x 6 , 6 : 0 , 125 x 5 = 19 , 8 x 5 x 88 , 88 x 13 , 2 x 4 3 , 3 x 88 , 88 x 2 x 6 , 6 x 8 x 5 = 19 , 8 x 5 x 88 , 88 x 13 , 2 x 4 3 , 3 x 88 , 88 x 13 , 2 x 4 x 2 x 5 = 19 , 8 3 , 3 x 2 = 3
Tìm X,biết
631-\(\frac{2}{3}\):X=125
\(631-\frac{2}{3}:x=125\)
\(\frac{2}{3}:x=631-125\)
\(\frac{2}{3}:x=506\)
\(x=\frac{2}{3}:506\)
\(x=\frac{1}{759}\)