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$5x + 9x =$
$15x + 7x =$
$x + 7x - 4x =$
$a + 9a =$
$2.4n × 6 =$
$12 + 12 + 3x =$
$5b - 5b =$
$1.8 + n + n =$
$5.2m × 2n =$
$12y - y =$
$3.6b × 3 =$
$7.3 + (m + 2.7) =$
$13n × 4 =$
$16x + 35x =$
$0.36 × 6m =$
$15x + 7x =$
$x + 7x - 4x =$
$a + 9a =$
$2.4n × 6 =$
$12 + 12 + 3x =$
$5b - 5b =$
$1.8 + n + n =$
$5.2m × 2n =$
$12y - y =$
$3.6b × 3 =$
$7.3 + (m + 2.7) =$
$13n × 4 =$
$16x + 35x =$
$0.36 × 6m =$
答案
1. 14x 22x 4x 10a 14.4n 24+3x 0 1.8+2n 10.4mn 11y 10.8b 10+m 52n 51x 2.16m
4.5 + (5.5 + b) = ( + ) + b
m + 2.5 + 7.5 = m + ( + )
1.25 × n × 8 = × × n
a × 2.5 × 40 = a × ( × )
c × 101 = c × ( + )
3.9 × a + 6.1 × a = × ( + )
m + 2.5 + 7.5 = m + ( + )
1.25 × n × 8 = × × n
a × 2.5 × 40 = a × ( × )
c × 101 = c × ( + )
3.9 × a + 6.1 × a = × ( + )
答案
2. 4.5 5.5 2.5 7.5 1.25 8 2.5 40 100 1 a 3.9 6.1
6.03×37=
68.07−23.45=
98×0.45=
35.04÷96=
91÷26=
2.88÷12=
68.07−23.45=
98×0.45=
35.04÷96=
91÷26=
2.88÷12=
答案
3. 223.11 44.62 44.1 0.365 3.5 0.24
（竖式略）
（竖式略）
李师傅每天加工150个零件。如果用t表示工作时间，c表示工作总量，分别写出它们之间的数量关系。
(1) $t=$
(2) 当$t=5$时，$c=$(
(1) $t=$
c÷150
$c=$ 150t
(2) 当$t=5$时，$c=$(
750
)；当$c=1200$时，$t=$(8
)。答案
4. (1) c÷150 150t
(2) 750 8
(2) 750 8
