问题 解答题
心算.
1.5×3=
0.03×5=12×0.003=
0.9×7=4×0.08=15×0.004=
0.5×6=0.06×3=1.25×8=
8×0.9=5×0.005=18×0.002=
答案

1.5×3=4.50.03×5=0.1512×0.003=0.036
0.9×7=6.34×0.08=0.3215×0.004=0.06
0.5×6=30.06×3=0.181.25×8=10
8×0.9=7.25×0.005=0.02518×0.002=0.036

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