Question

請把小數(shù)點(diǎn)填上．
8×0.39=312     
0.8×5.37=4296
2×3.45=69
6.35×2.6=1651
66×3.45=2277
4.44×1.5=666．

Answer 1

考點(diǎn)：小數(shù)乘法

專題：運(yùn)算順序及法則

分析：積的小數(shù)位數(shù)等于兩個(gè)因數(shù)中小數(shù)位數(shù)的和，但是兩個(gè)因數(shù)的末尾的兩個(gè)數(shù)相乘得整十，積的小數(shù)部分的位數(shù)比兩個(gè)因數(shù)中小數(shù)位數(shù)的和要少，由此進(jìn)行解答即可．

解答： 解：8×0.39=3.12
0.8×5.37=4.296
2×3.45=6.9
6.35×2.6=16.51
66×3.45=227.7
4.44×1.5=6.66．

點(diǎn)評(píng)：兩個(gè)小數(shù)相乘，所得的積的小數(shù)位數(shù)，等于兩個(gè)因數(shù)中小數(shù)位數(shù)的和．