一、解方程。
$6x+3=6$
$2(x+3.8)=10$
$3(8+x)÷2=18$
$7x=2x+15$

解：$6x+3=6$
$6x=6-3$
$6x=3$
$x=3÷6$
$x=0.5$
解：$2(x+3.8)=10$
$x+3.8=10÷2$
$x+3.8=5$
$x=5-3.8$
$x=1.2$
解：$3(8+x)÷2=18$
$3(8+x)=18×2$
$3(8+x)=36$
$8+x=36÷3$
$8+x=12$
$x=12-8$
$x=4$
解：$7x=2x+15$
$7x-2x=15$
$5x=15$
$x=15÷5$
$x=3$

二、列综合算式计算或列方程求解。
一个数的8倍比它的6倍多10,求这个数。
44与22的和被它们的差除,商是多少?

解：设这个数为x。
8x - 6x = 10
2x = 10
x = 5
(44 + 22) ÷ (44 - 22)
= 66 ÷ 22
= 3
答：商是3。

三、应用题。
乐乐在操场上练习跳绳,前3次跳完后的平均成绩是92个。第4次跳完后,乐乐的4次跳绳平均成绩是94个。乐乐第4次跳了多少个?
第15页“找一找”的答案:山重水复(柳暗花明) 无可奈何(似曾相识) 万紫千红
曾经沧海 不堪回首
看图,将正确答案填在前面的括号内。Choose the best answer.

()(1) It is today.
A. Friday B. Saturday C. Sunday
()(2) There are people in the room.
A. three B. four C. five
()(3) The old man is Zhang Hu's .
A. mother B. aunt C. grandfather
()(4) Zhang Hu is giving his grandmother .
A. a present B. some bananas C. some apples
()(5) There is a in Zhang Hu's father's hand.
A. box B. bag C. bag of fruit
()(6) What's in Zhang Hu's mother's hand? There is a .
A. box B. toy car C. bag of fruit
()(7) There is a in the room.
A. chair B. desk C. sofa
()(8) Zhang Hu is .
A. visiting his grandparents with his parents
B. living with his grandparents
C. going to the cinema with his grandparents
第21页“填一填”第1题的答案:怨言 戏言 留言 遗言 谣言

解：94×4 - 92×3
= 376 - 276
= 100（个）
答：乐乐第4次跳了100个。
(1) B
(2) C
(3) C
(4) A
(5) B
(6) C
(7) C
(8) A