1 5 7 10 13 15 a 19,20 b 19 25 c 17 25 d 17 20 求详解
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1 5 7 10 13 15 a 19,20 b 19 25 c 17 25 d 17 20 求详解
1 5 7 10 13 15 a 19,20 b 19 25 c 17 25 d 17 20 求详解
1 5 7 10 13 15 a 19,20 b 19 25 c 17 25 d 17 20 求详解
选a
5-1=4
10-7=3
15-13=2
所以下两项,后项-前项=1
只有a满足,20-19=1
a=17
b=17
c=17
d=17
两个两个一组
1 5
7 10
13 15
分别相差4、3、2
所以后一组应该相差1
即19、20
请问,这17道关于一元一次方程的题目我做对了吗?(1)A-5=6A-5+5=6+5A=11(2)0.3A=45A=13.5(3)5A+4=05A=4A=0.8(4)5A-2A=93A=9A=3(5)-3A+0.5A=10-2.5A=10A=4(6)6A-4=4A-56A-4A=-5+42A=-1A=0.5(7)2A+3A+4A=189A=18A=2(8)13A-15A+A=-3-3A=-3A=1(9)
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逻辑运算中的A表示什么 (1) 0 · A = 0 (10) 1' = 0; 0' = 1 (2) 1 · A = A (11) 1 + A = 1 (3) A · A = A (12) 0 + A = A (4) A · A' = 0 (13) A + A = A (5) A · B = B · A (14) A + A' = 1 (6) A·(B·C) = (A·B)·C (15
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