A=(a x 7 +a x 8 -a x 15) : (1+2+3+.........+10)
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a) 7 - ( 18 + x ) = - 15
18 + x = 7+ 15
18 + x = 22
x = 22 - 18
x = 4
vậy x= 4
Trl:
a) \(7-\left(18+x\right)=-15\)
\(\Rightarrow\left(18+x\right)=7-\left(-15\right)\)
\(\Rightarrow\left(18+x\right)=7+15\)
\(\Rightarrow\left(18+x\right)=22\)
\(\Rightarrow x=22-18\)
\(\Rightarrow x=4\)
b) \(\left(x-17\right)-\left(-3\right)=0\)
\(\Rightarrow\left(x-17\right)+3=0\)
\(\Rightarrow\left(x-17\right)=0-3\)
\(\Rightarrow\left(x-17\right)=-3\)
\(\Rightarrow x=-3+17\)
\(\Rightarrow x=14\)
-Để 159a235b chia hết cho cả 2,3,5 và 9 thì b phải bằng 0
-Để 159a2350 chia hết cho 3 và 9
=>1+5+9+a+2+3+5 chia hết cho 3,9
=>25+a chia hết cho 3 và 9
=>a =2
Vậy a =2,b=0
a. 127 : 67 = 27
b. 275 : 813 = (33)5 : (34)3 = 315 : 312 = 33
c. 183 : 93 = 23
d. 1253 : 254 = (53)3 : (52)4 = 59 : 58 = 5
1) He worked at night when he worked in the supermarket.
→ He used to work at night when he worked in the supermarket.
2) Did they watch TV in the past ?
→ Did they use to watch TV in the past?
3) She played badminton in her free time.
→ She used to play badminton in her free time.
4) They went swimming in the afternoon in 1990.
→ They used to go swimming in the afternoon in 1990.
5) He was a doctor in that hospital.
→ He used to be a doctor in that hospital.
☘ Perfect Answer ☘
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A=a x (7+8-15) : (1+2+....+10)
A= a x 0 :(1+2+...+10)
A = 0 : ( 1+2+...+10)
A= 0