算一算
$3.17 + 3.43 =$
$6.82 + 15.55 =$
$12.23 + 4.57 =$
$23.75 + 8.64 =$
$17.83 + 9.5 =$
$45.7 + 6.55 =$
$27.8 + 8.33 =$
$26 + 7.98 =$
$102.67 + 3.56 =$
$0.85 + 1.15 =$
$3.17 + 3.43 =$
$6.82 + 15.55 =$
$12.23 + 4.57 =$
$23.75 + 8.64 =$
$17.83 + 9.5 =$
$45.7 + 6.55 =$
$27.8 + 8.33 =$
$26 + 7.98 =$
$102.67 + 3.56 =$
$0.85 + 1.15 =$
答案
$3.17 + 3.43 = 6.6$
$6.82 + 15.55 = 22.37$
$12.23 + 4.57 = 16.8$
$23.75 + 8.64 = 32.39$
$17.83 + 9.5 = 27.33$
$45.7 + 6.55 = 52.25$
$27.8 + 8.33 = 36.13$
$26 + 7.98 = 33.98$
$102.67 + 3.56 = 106.23$
$0.85 + 1.15 = 2$
$6.82 + 15.55 = 22.37$
$12.23 + 4.57 = 16.8$
$23.75 + 8.64 = 32.39$
$17.83 + 9.5 = 27.33$
$45.7 + 6.55 = 52.25$
$27.8 + 8.33 = 36.13$
$26 + 7.98 = 33.98$
$102.67 + 3.56 = 106.23$
$0.85 + 1.15 = 2$
1. 含有未知数的(
等式
)叫作方程。答案
1. 等式
2. 5个x相加的和是15,列方程为($\boldsymbol{5x=15}$)。
答案
2. $5x=15$
3. 超市原有78箱银桥牛奶,又运来y箱,现在一共有150箱银桥牛奶,列方程为( )。
答案
3. $78+y=150$
4.笑笑今年x岁,爸爸的年龄是她的4倍,爸爸今年( )岁。
答案
4. $4x$
5. 一个直角三角形的一个锐角是$a$,另一个锐角是$35°$,根据等量关系,列方程为($\qquad\qquad$)。
答案
5. $a + 35 = 90$
二、选一选。(在方程后面对应的括号里画“√”)
$5x + 8$ ()
$4y = 5x$ (
$42 - 3y = 5$ (
$18 × 0.5 = 9$ ()
$x - 8 > 10$ ()
$a ÷ 5 = 7$ (
$72 - 9 = 63$ ()
$4y + 5y = 7 × 8$ (
$31 - 2x = 6$ (
$9x = 0$ (
$7x < 5$ ()
$25 ÷ x$ ()

36
$5x + 8$ ()
$4y = 5x$ (
√
)$42 - 3y = 5$ (
√
)$18 × 0.5 = 9$ ()
$x - 8 > 10$ ()
$a ÷ 5 = 7$ (
√
)$72 - 9 = 63$ ()
$4y + 5y = 7 × 8$ (
√
)$31 - 2x = 6$ (
√
)$9x = 0$ (
√
)$7x < 5$ ()
$25 ÷ x$ ()
36
答案
$5x + 8$ ( )
$4y = 5x$ (√)
$42 - 3y = 5$ (√)
$18 × 0.5 = 9$ ( )
$x - 8 > 10$ ( )
$a ÷ 5 = 7$ (√)
$72 - 9 = 63$ ( )
$4y + 5y = 7 × 8$ (√)
$31 - 2x = 6$ (√)
$9x = 0$ (√)
$7x < 5$ ( )
$25 ÷ x$ ( )
$4y = 5x$ (√)
$42 - 3y = 5$ (√)
$18 × 0.5 = 9$ ( )
$x - 8 > 10$ ( )
$a ÷ 5 = 7$ (√)
$72 - 9 = 63$ ( )
$4y + 5y = 7 × 8$ (√)
$31 - 2x = 6$ (√)
$9x = 0$ (√)
$7x < 5$ ( )
$25 ÷ x$ ( )
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