问题 解答题
口算.
1.05×3=
0.4×0.6=1.4×0.6=2.1×1+2.1=
0.05×12=0.85×6=1.9×0.2=1.25×8×4=
答案

1.05×3=3.150.4×0.6=0.241.4×0.6=0.842.1×1+2.1=4.2
0.05×12=0.60.85×6=5.11.9×0.2=0.381.25×8×4=40

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