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a) 15.(-236) + 15.235
= 15.(-236 + 235)
= 15.(-1)
= -15
b) 237.(-28) + 28.137
= 237.(-28) - (-28).137
= (-28).(237 - 137)
= (-28).100
= -2800
c) 38.(27 - 44) - 27.(38 - 44)
= 38.27 - 38.44 - 27.38 + 27.44
= (38.27 - 27.38) + (-38). 44 + 27 . 44
= 0 + 44.[(-38)+27]
= 44.(-11)
= -484
283-286-83+86-55
= (283-83)+(286+55)-86
= 200+ 231-86=345
C) 38x(27-44) -27 x (38-44)
= 38x27-38x44-27x38-27x44
=(38x27-27x38) + (38x44-27x44)
=0+484
=484
=(32x100+44x100) : (27x38+73x38)=\(\frac{100x\left(32+44\right)}{\left(27+73\right)x38}=\frac{100x76}{100x38}=2\)
36 + 48 + 40 + 42 + 44 + 46 + 48 + 50
= (36 + 48) + (40 + 50) + (42 + 48) + (44 +46)
= 84 + 90 + 90 + 90
= 74 + 90 \(\times\) 3
= 74 + 270
= 344
36 + 38 + 40 + 42 + 44 + 46 + 48 + 50
= (36 + 50){ (50-36):2+1}: 2
= 344
85.(35-27)-35.(85-27)
=85.35-85.27-35.85-35.27
=85.35(1-1)-27(85-35)=
=0-27.50
=-1350
b)
16.(38-12)-38(16-12)
=16.38-16.12-38.16-38.12
=16.38(1-1)-12(16-38)
=16.38.0-12.-22
=0+264
=264
chúc bn hok tốt
1: =-2/9(15/17+2/17)=-2/9
2: \(=\dfrac{-6}{3}+\dfrac{-21}{90}\)
=-2-7/30=-67/30
3: \(=\dfrac{3}{4}\cdot\dfrac{7}{5}+\dfrac{9}{7}\cdot\dfrac{3}{2}\)
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
1: =-2/9(15/17+2/17)=-2/9
2: =−63+−2190=−63+−2190
=-2-7/30=-67/30
3: =34⋅75+97⋅32=34⋅75+97⋅32
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
38.(27 - 44) - 27.(38 - 44)
= 38.27 - 38.44 - 27.38 + 27.44
= (38.27 - 27.38) - (38.44 - 27.44)
= 0 - 44.(38 - 27)
= - 44.11
= - 484