2026年口算基础训练一年级数学下册人教版第39页答案
6算一算
(1) 45 - 3 = (
)
)

想：先算 5 - 3 = (
)
)
再算 40 + (
)
) = (
)
)
(2) 45 - 30 = (
)
)

想：先算 40 - 30 = (
)
)
再算 10 + (
)
) = (
)
)

答案

(1)
$45 - 3 = (42)$
想：先算$5 - 3 = (2)$
再算$40 + (2) = (42)$
(2)
$45 - 30 = (15)$
想：先算$40 - 30 = (10)$
再算$10 + (5) = (15)$
算一算
$68 - 30 =$
$68 - 3 =$
$87 - 20 =$
$87 - 2 =$
$79 - 60 =$
$79 - 6 =$
$54 - 20 =$
$54 - 2 =$
$86 - 50 =$
$86 - 5 =$
$48 - 40 =$
$48 - 4 =$
$45 - 33 =$
$56 - 21 =$
$65 - 45 =$
$76 - 60 =$
$88 - 32 =$

答案

68-30=38
68-3=65
87-20=67
87-2=85
79-60=19
79-6=73
54-20=34
54-2=52
86-50=36
86-5=81
48-40=8
48-4=44
45-33=12
56-21=35
65-45=20
76-60=16
88-32=56