tinh nhanh 25×(32+47)-32×(25+47)
Tinh nhanh:
25.(32+47)-32.(25+47)
25.(32 + 47) - 32.(25 - 47)
= 25.32 + 25.47 - 32.25 - 32.47
= (25.32 - 32.25) + 25.47 - 32.47
= 0 + 47.(25 - 32)
= 47. (-7)
= -329
25.32+25.47-32.25+32.47
(25-25).32+25.47+32.47
0+25.47+32.47
(25+32).47
25.(32+47)-32.(25+47)
=25.79-32.72
=1975-2304
= -329
25.(32+47)-32.(25+47)
25.(32+47)-32.(25+47)
= 25.32 + 47.25 - 32.25 +47.32
= 32,(25-25) + 47.(25-32)
= 47.(-7)
= -329
=25.79-32.72
=1975-2304
=-329
25.(32+47) + 32.(25-47)
25.(32+47)+32.(25-47)
= -(25.32+25.47)+(32.25-32.47)
= -25.32+32.47 + 32.25-32.47
= (-25.32+32.25)-(25.47+32.47)
= 0 - 47.(25+32)
= -47.57
= -2649
25 nhân (32-47)-32 nhân(25-47)
Đề:25.(32-47)-32.(25-47)
=25.(-15)-32.(-22)
=-375-(-704)
=329
Dấu . là nhân nha
\(25\cdot\left(32-47\right)-32\cdot\left(25-47\right)=25\cdot32-25\cdot47-32\cdot25+32\cdot47=\left(25\cdot32-32\cdot25\right)+\left(32\cdot47-25\cdot47\right)=0+47\cdot\left(32-25\right)\)
\(=47\cdot7=409\)
Bài 1.Tính nhanh:
a) -3752-(29-3632)-51
Bài 2:
a)-69.72-31.70-31.2
b)-25.(47-32)-32.(25-47)
Bài 1:
=-3752-29+3632-51
=-120-80=-200
Bài 2:
b: \(=-25\cdot47+25\cdot32-25\cdot32+32\cdot47=47\cdot7=329\)
Bt Tính
—(—315)+(—115)—105+25
888—(—333)—222+70
25×(32+47)—32×(25+47)
a.
\(-\left(-315\right)+\left(-115\right)-105+25=315-115-105+25=120\)
b.
\(888-\left(-333\right)-222+70=888+333-222+70=1069\)
c.
\(25\times\left(32+47\right)-32\times\left(25+47\right)=25\times32+25\times47-32\times25-32\times47=-47\times\left(32-25\right)=-47\times7=-329\)
1. Tính hợp lí nếu có thể
a) 25*(32+47)–32*25–32*(25+47)
b) [3*(-2)–(-8)]*(-7)–(-2)*(-5)
c) (-3)^2+3^3–(-3)^0
2.Tính nhanh
a) 4524–(864–999)–(36+3999)
b) 100–(137+572)+(263–291)
c) (-329)+(15–101)–(25–440)
2 ) tính nhanh :
4524 - ( 864 - 999 ) - ( 36 + 3999 )
= 4524 - 864 + 999 - 36 - 3999
= 4524 + ( -864 - 36 ) + ( 999 - 3999 )
= 4524 + ( -900 ) + ( -3000 )
= -3624 + -3000
= -6624
a) 25. (32 + 47 ) - 32. (25 + 47 )
b) 48 . (21 -19 ) - 21 . (48 - 19 ) + 27 .(-81)
a/ 25 x ( 32 + 47 ) - 32 x ( 25 + 47 )
= 25 x 79 - 32 x 72
= 1975 - 2304
= -329
b/ 48 x ( 21- 19 ) - 21 x ( 48 - 19 ) + 27 x ( -81 )
= 48 x 2 - 21 x 29 + 27 x ( -81 )
= 96 - 609 + -2187
= -2700
cau co phai vu phuong huyen ko.Neu phai thi cau hay vao ket ban voi to
a) 25.(32+47)-32.(25+47)
=25.32+25.47-32.25+32.47
=32.(25-25-47)+25.47
=32.(-47)+25.47
=47.((-32)+25)
=47.(-7)
=-329.
b) làm tương tự phần a bạn nha.
tính nhanh
a/[25-(-75)]+32-(32+55)
b/25.17.(-4).125.(-8)
c/(-14).9-13.(-9)
d/37.90-37.(-10)
e/29.(100-47)+85.(47-29)
f/47.(23+50)-23.(47+50)
g/45-5.(17+9)-17.(-15)
h/(-8).(-25)+52.23