\(15(-176)+15\times76\)
15/6+15/66+15/176+...+15/1116
Tính hợp lí a) -37.86+37.76 b)-79.81+79.31-79.50 c)15.(-176)+15.75-(-15)
a: \(-37\cdot86+37\cdot76\)
\(=-37\left(86-76\right)\)
\(=-37\cdot10=-370\)
b: \(-79\cdot81+79\cdot31-79\cdot50\)
\(=79\left(-81+31-50\right)\)
\(=79\cdot\left(-100\right)=-7900\)
c: \(15\cdot\left(-176\right)+15\cdot75-\left(-15\right)\)
\(=15\cdot\left(-176\right)+15\cdot75+15\)
\(=15\left(-176+75+1\right)\)
\(=15\cdot\left(-100\right)=-1500\)
a: −37⋅86+37⋅76
=−37(86−76)
=−37⋅10
=−370
b: −79⋅81+79⋅31-79.50
=79(−81+31−50)
=79⋅(−100)
=−7900
c: 15⋅(−176)+15⋅75−(−15)
=15⋅(−176)+15⋅75+15
=15(−176+75+1)
=15⋅(−100)
=−1500
176 :15=??????????????
(176* 125*316) : (88* 15* 158)
Rút gọn biểu thức:
a) (-37) – (x + 23) + 15 =
b) 176 – (176 - x + 42) =
c) 1270 – (1270 – 2x) + 31 =
d) 2x + (-141) – (231 – 461) =
Lời giải:
a.
$=-37-x-23+15=-x-(37+23)+15=-x-60+15=-x-(60-15)=-x-45$
b.
$=176-176+x-42=0+x-42=x-42$
c.
$=1270-1270+2x+31=0+2x+31=2x+31$
d.
$=2x-141-231+461=2x-(141+231)+461=2x-372+461$
$=2x+(461-372)=2x+89$
tinh hop li:
a)1050:15-350:5+176/176
b)4320:9-8640:18+450/250
c)45*16-17/28+45*15
d)42313*846267-423133/423133*846267+423134
Tính bằng cách thuận tiện: 176 + 15 + 24 + 235
a) 176 + 15 + 24 + 235 = ( 176 + 24) + ( 15 + 235)
= 200 + 250
= 450
\(-37(86)+37\times76\)
\(-37.86+37.76\)
\(=37.\left(-86\right)+37.76\)
\(=37\left(-86+76\right)\)
\(=37.\left(-10\right)=-370\)
-37(86)+37×76
-37(86)+2812
-370
Bài làm
\(-37.86+37.76=37\left(-86+76\right)\)
\(=37.10=370\)
Tính Nhanh:
1050 : 15 - 350 : 5 + 176
1050 : 15 - 350 : 5 + 167
= 70 - 70 + 167
= 0 + 167
= 167
~ Hok tốt ~
ko ghi lại đề bài
=70-70+167
=0+167
=167
hc tốt
ko ghi lại đề bài
=70-70+167
=0+167
=167
hc tốt