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一、口算。
$6.8×0.3=
$2.4×5 =
$0.65×0.4 =
$0.5 + 1.35 =
$2.07×60 =
$1.8×5 =
$0.76 + 0.54 =
$1.7÷0.5 =
$6.8×0.3=
2.04
$ $2.3 - 1.12 =1.18
$ $3.8 + 0.6 =4.4
$$2.4×5 =
12
$ $0.63×30 =18.9
$ $0.3÷10 =0.03
$$0.65×0.4 =
0.26
$ $0.84÷2.1 =0.4
$ $9.6÷0.32 =30
$$0.5 + 1.35 =
1.85
$ $0.125×40 =5
$ $10.3×100 =1030
$$2.07×60 =
124.2
$ $0.93÷3.1 =0.3
$ $0.7 - 0.62 =0.08
$$1.8×5 =
9
$ $6.4÷1.6 =4
$ $4÷0.8 =5
$$0.76 + 0.54 =
1.3
$ $5.6 - 2.3 =3.3
$ $7.82 - 7.2 =0.62
$$1.7÷0.5 =
3.4
$ $7.5÷5 =1.5
$ $80.4÷0.4 =201
$答案
2.04 1.18 4.4 12 18.9 0.03 0.26 0.4 30 1.85 5 1030 124.2 0.3 0.08 9 4 5 1.3 3.3 0.62 3.4 1.5 201
二、计算下面各题,怎样简便就怎样计算。
$0.55×1.2÷1.5 + 18.2$ $0.46 + (7.49 + 9.79)÷24$
$101×4.9$ $(4.72 + 5.63)×(1.2 - 0.3)$
$0.55×1.2÷1.5 + 18.2$ $0.46 + (7.49 + 9.79)÷24$
$101×4.9$ $(4.72 + 5.63)×(1.2 - 0.3)$
答案
18.64 1.18 494.9 9.315
解析
0.55×1.2÷1.5 + 18.2
=0.66÷1.5 + 18.2
=0.44 + 18.2
=18.64
0.46 + (7.49 + 9.79)÷24
=0.46 + 17.28÷24
=0.46 + 0.72
=1.18
101×4.9
=(100 + 1)×4.9
=100×4.9 + 1×4.9
=490 + 4.9
=494.9
(4.72 + 5.63)×(1.2 - 0.3)
=10.35×0.9
=9.315
=0.66÷1.5 + 18.2
=0.44 + 18.2
=18.64
0.46 + (7.49 + 9.79)÷24
=0.46 + 17.28÷24
=0.46 + 0.72
=1.18
101×4.9
=(100 + 1)×4.9
=100×4.9 + 1×4.9
=490 + 4.9
=494.9
(4.72 + 5.63)×(1.2 - 0.3)
=10.35×0.9
=9.315
