直接寫出得數(shù):
35×20=
700
700
2.5×0.4=
1
1
0.8×0.5=
0.4
0.4
;
208÷100=
2.08
2.08
1.5×0.04=
0.06
0.06
;
0.04×0.2=
0.008
0.008
;
36÷1000=
0.036
0.036
0×0.37=
0
0
;
1.7+0.43+3.3=
5.43
5.43
0.5×0.12×0.2=
0.012
0.012
;
1.2÷100×4=
0.048
0.048
;
0.25×0.7×0.4=
0.07
0.07
分析:根據(jù)小數(shù)加減乘除法的計算方法進(jìn)行口算,能簡算的要簡算.
解答:解:35×20=700; 2.5×0.4=1; 0.8×0.5=0.4; 208÷100=2.08;
1.5×0.04=0.06; 0.04×0.2=0.008; 36÷1000=0.036; 0×0.37=0;
1.7+0.43+3.3=5.43; 0.5×0.12×0.2=0.012; 1.2÷100×4=0.048; 0.25×0.7×0.4=0.07.
故答案為:700,1,0.4,2.08,0.06,0.008,0.036,0,5.43,0.012,0.048,0.07.
點評:口算,要靈活運用所學(xué)知識,快速準(zhǔn)確的進(jìn)行計算,特別要注意小數(shù)點的位置.
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