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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
37.24 + 37.76 + 63 . 79 + 21 . 63
= 37 . ( 24 + 76 ) + 63 . ( 79 + 21 )
= 37 . 100 + 63 . 100
= 3700 + 6300
= 10000
a) 37.24 + 37.76 + 63.79 + 21.63
= 37.(24 + 76) + 63.(79 + 21)
= 37.100 + 63. 100
= 100.(37 +63)
= 100.100
= 10000
b) 69.113 - 27.69 + 69.14 + 31
= 69.(113 - 27 + 14) +31
= 69.100 + 31
= 6931
c) 72.121 + 27.121 + 121
= 121.(72 + 27 + 1)
= 121.100
= 12100
(-37).86 + 37.76
= 37.(-86) + 37.76
= 37.(-86 + 76)
= 37.(-10)
= -370
37 . 24 + 37 . 76 + 6. 79 + 63 . 21
= 37 ( 24 + 76 ) + 6 . 79 + 63 . 21
= 37 . 100 + 6 . 79 + 63 . 21
= 3700 + 474 + 84
=4258
tk mk nha
Sửa đề + Lời giải :
\(37.24+37.76+63.79+63.21\)
\(=37.\left(24+76\right)+63.\left(79+21\right)\)
\(=37.100+63.100\)
\(=3700+6300\)
\(=100000\)
a)\(37.24+37.76+63.79+63.21=37.\left(24+76\right)+63.\left(79+21\right)\)
\(=37.100+63.100\)
\(=\left(37+63\right).100\)
\(=100.100\)
\(=10000\)
b)\(27.\left(13+48\right)+27.\left(22+17\right)=27.\left(13+48+22+17\right)\)
\(=27.100\)
\(=2700\)
1 + 2 + 3 + 4 + ..... + 49 + 50(có 50 số hạng)
=51 × 25 = 1275
2 . 17 . 12 + 4 . 6 . 21 + 8 . 3 . 62
= 24 . 17 + 24 . 21 + 24 . 62
= 24 . ( 17 + 21 + 62 )
= 24 . 100 = 2400
37 . 24 + 37 . 76 + 63 . 79 + 63 . 21
= 37 . (24 + 76) + 63 . (79 + 21)
= 37 . 100 + 63 . 100
= (37 + 63 ) . 100
= 100 . 100 = 10000
2020 . 43 + 2020 . 56 + 2020
= 2020 . 43 + 2020 . 56 + 2020 . 1
= 2020 . ( 43 + 56 + 1 )
= 2020 . 100 = 202000
37 - 2 ( 18 - x ) = - 15
37 - 36 + 2x = - 15
1 + 2x = - 15
2x = - 15 - 1
2x = - 16
x = - 8
37 - 2.(18 - x) = -15
=> 2.(18 - x) = 37 + 15
=> 2.(18 - x) = 52
=> 18 - x = 52 : 2
=> 18 - x = 26
=> x = 18 - 26
=> x = -8
\(2.17.12+4.6.21+8.3.62\)
\(=24.17+24.21+24.62\)
\(=24\left(17+21+62\right)\)
\(=24.100\)
\(=2400\)
\(37.24+37.76+63.79+63.21\)
\(=37\left(27+76\right)+63\left(79+21\right)\)
\(=37.100+63.100\)
\(=3700+6300\)
\(=10000\)
-37.86+37.76=-0.1
\(-37.86+37.76=37.\left(-86\right)+37.76\)
\(=37.\left(-86+76\right)\)
\(=37.\left(-10\right)=-370\)