挑战习题
1
/5
单选题
难度:
1.对方程7(3-x)-5(x-3)=8去括号正确的是()
A
21-x-5x+15=8
B
21-7x-5x-15=8
C
21-7x-5x+15=8
D
21-x-5x-15=8
提示1:
5ous5Y+35aSW55qE5Zug5pWw5piv5q2j5pWw77yM5Y675ous5Y+35ZCO5Y6f5ous5Y+35YaF5ZCE6aG555qE56ym5Y+35LiO5Y6f5p2l55qE56ym5Y+355u45Y+N44CC
正确答案:
Qw==
5ous5Y+35aSW55qE5Zug5pWw5piv5q2j5pWw77yM5Y675ous5Y+35ZCO5Y6f5ous5Y+35YaF5ZCE6aG555qE56ym5Y+35LiO5Y6f5p2l55qE56ym5Y+355u45Y+N44CC6YCJQw==
2
/5
单选题
难度:
2.把方程7(x-3)-4(x+4)=5x去括号后为____.
A
7x-21-4x-16=5x
B
7x-21+4x-16=5x
C
7x-21-4x-16=-5x
D
7x+21-4x-16=5x
提示1:
5ous5Y+35aSW55qE5Zug5pWw5piv5q2j5pWw77yM5Y675ous5Y+35ZCO5Y6f5ous5Y+35YaF5ZCE6aG555qE56ym5Y+35LiO5Y6f5p2l55qE56ym5Y+355u45Y+N44CC
正确答案:
QQ==
5ous5Y+35aSW55qE5Zug5pWw5piv5q2j5pWw77yM5Y675ous5Y+35ZCO5Y6f5ous5Y+35YaF5ZCE6aG555qE56ym5Y+35LiO5Y6f5p2l55qE56ym5Y+355u45Y+NLumAiUE=
3
/5
单选题
难度:
3.方程2(m+x)=5x-6的解是x=1,则m等于()
A
B
C
D
提示1:
5oqKeD0x5Luj5YWl5pa556iL5Lit77yM6Kej5YWz5LqObeeahOaWueeoiw==
正确答案:
Qw==
5oqKeD0x5Luj5YWl5pa556iL77yM5b6XMu+8iG0rMe+8iT01LTbvvIzop6PlvpdtPS08aW1nIHdpZHRoPTE0IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzkxL0FFL3JCQUNKMVdiZEVIRFV4TU5BQUFCWUV6YXpzZzY4NC5wbmciPg==
4
/5
单选题
难度:
4.64x与92(6-x)的和是496,则x=____.
A
-1
B
-2
C
1
D
2
提示1:
5YWI5YiX5pa556iL77yM5ZCO6Kej5pa556iL
提示2:
5pWw5YC86L6D5aSn77yM6K6h566X6KaB6K6k55yf
正确答案:
Qg==
NjR4KzkyKDYteCk9NDk2LOWOu+aLrOWPt+W+l++8jDY0eCs1NTItOTJ4PTQ5Niznp7vpobnlkIjlubblkIznsbvpobnlvpfvvIwtMjh4PTU2LOino+W+l3g9LTI=
5
/5
单选题
难度:
5.如果A=2(x+3),B=3(1-x),且A+B=0,则x=____.
A
6
B
3
C
9
D
18
提示1:
5YWI5YiX5pa556iL77yM5ZCO6Kej5pa556iL
正确答案:
Qw==
Mih4KzMpKzMoMS14KT0wLOWOu+aLrOWPt+W+l++8jDJ4KzYrMy0zeD0wLOenu+mhueW+lzJ4LTN4PS02LTMs5ZCI5bm25ZCM57G76aG55b6X77yMLXg9LTks6Kej5b6XeD05Lg==