一、口算。
$1.9×0.3=$
$1÷0.25=$
$0.48×0.5=$
$12.5×20=$
$0.6÷5=$
$0.32×0.4=$
$5.2÷0.4=$
$1.2÷0.24=$
$1.9×0.3=$
0.57
$7.5a - 0.5a=$7a
$0.72÷(0.2×4)=$0.9
$1÷0.25=$
4
$7.2a + 2.8a=$10a
$1.6×9 + 1.6=$16
$0.48×0.5=$
0.24
$m - 0.81m=$0.19m
$6.8×2÷1.7=$8
$12.5×20=$
250
$0.83x + 0.62x=$1.45x
$7.2÷0.06×2=$240
$0.6÷5=$
0.12
$0.7x - 0.62x=$0.08x
$8.44×0.5×20=$84.4
$0.32×0.4=$
0.128
$x - 0.6x=$0.4x
$3.5÷2.5÷0.2=$7
$5.2÷0.4=$
13
$1.72n - 0.4n=$1.32n
$14.71 - (3.2 + 1.71)=$9.8
$1.2÷0.24=$
5
$3y + 5.5y=$8.5y
$0.4×3.5×2=$2.8
答案
一、0.57 7a 0.9 4 10a 16 0.24 0.19m 8 250 1.45x 240 0.12 0.08x 84.4 0.128 0.4x 7 13 1.32n 9.8 5 8.5y 2.8
二、用竖式计算。
$62.2 - 3.19$ $0.045×6.4$ $24.8÷1.6$
$8.77 + 1.24$ $1.368÷0.24$ $71.2×3.4$
$62.2 - 3.19$ $0.045×6.4$ $24.8÷1.6$
$8.77 + 1.24$ $1.368÷0.24$ $71.2×3.4$
答案
二、59.01 0.288 15.5 10.01 5.7 242.08
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