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6: =>x=9/10+1/5=9/10+2/10=11/10
7: =>x=3/8-5/12=36/96-40/96=-1/24
8: =>x=7/6-5/4=14/12-15/12=-1/12
9: =>x=1/35+2/7=1/35+10/35=11/35
10: =>x=2/7-7/10=20/70-49/70=-29/70
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1: =>x=-5/3-1/2=-13/6
2: =>x=1/3-3/5=-4/15
4: =>x=-7/9+4/3=-7/9+12/9=5/9
5: =>x=5/6-7/3=5/6-14/6=-9/6=-3/2
6: =>x=9/10+1/5=11/10
7: =>x=3/8-5/12=36/96-40/96=-1/24
8: Đề sai rồi bạn
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a) 198 + 232 - 98 - 32 = (232 - 32) + (198 - 98) = 300.
b) 567 - 32 - 68 = 567 - (32 + 68) = 467.
c) 99 - 97 + 95 - 93 + 91 - 89+ ...+7 - 5 + 3 - 1
= (99 - 97) + (95 - 93) + (91 - 89) +... + (7 - 5) + (3 -1)
= 2 + 2 + 2 + . .. + 2 + 2 = 2.25 = 50.
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a) x = 2.
b) x = 7.
c) x= 12.
d) x= 45.
e) x = 18.
f) x = 10.
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d)37.7+43.7+80.3
=(37+43).7+80.3
=80.7+80.3
=80.(7+3)
=80.10=800
\(80-7\left(x-7\right)=95-3^2.6\)
\(\Rightarrow80-7\left(x-7\right)=95-54\)
\(\Rightarrow80-7\left(x-7\right)=41\)
\(\Rightarrow7\left(x-7\right)=80-41\)
\(\Rightarrow7\left(x-7\right)=39\)
\(\Rightarrow x-7=\dfrac{39}{7}\)
\(\Rightarrow x=\dfrac{39}{7}+7\)
\(\Rightarrow x=\dfrac{39}{7}+\dfrac{49}{7}\)
\(\Rightarrow x=\dfrac{88}{7}\)
\(80-7\left(x-7\right)=95-3^2.6\)
\(80-7\left(x-7\right)=95-9.6\)
\(80-7\left(x-7\right)=95-54\)
\(80-7\left(x-7\right)=41\)
\(7\left(x-7\right)=80-41\)
\(7\left(x-7\right)=49\)
\(x-7=49:7\)
\(x-7=7\)
\(x=7+7\)
\(\Rightarrow x=14\)