题目内容

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=
1.5×3=4.5 0.03×5=0.15 12×0.003=0.036
0.9×7=6.3 4×0.08=0.32 15×0.004=0.06
0.5×6=3 0.06×3=0.18 1.25×8=10
8×0.9=7.2 5×0.005=0.025 18×0.002=0.036
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