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一、口算。
$3.4×0.4= $
$0.3-0.03= $
$2-0.64-0.36= $
$0.42×50= $
$6.4÷0.16= $
$4.5-4.5÷3= $
$12.5×0.2= $
$7.6x+3.04x= $
$0.4×0.4a×25= $
$22.4×0.5= $
$0.92÷2.3= $
$7.2×9+7.2= $
$8.4-1.46= $
$1.8+3.02= $
$8.27-(1.73+3.27)= $
$3.52-3.25= $
$0.72×0.3= $
$25×3.3×0.4= $
$7.2÷0.9= $
$12.6÷0.9= $
$0.99+0.1÷10= $
$7.25-2.5= $
$1.2÷0.04= $
$(1-0.01)÷100= $
$3.4×0.4= $
1.36
$0.3-0.03= $
0.27
$2-0.64-0.36= $
1
$0.42×50= $
21
$6.4÷0.16= $
40
$4.5-4.5÷3= $
3
$12.5×0.2= $
2.5
$7.6x+3.04x= $
10.64x
$0.4×0.4a×25= $
4a
$22.4×0.5= $
11.2
$0.92÷2.3= $
0.4
$7.2×9+7.2= $
72
$8.4-1.46= $
6.94
$1.8+3.02= $
4.82
$8.27-(1.73+3.27)= $
3.27
$3.52-3.25= $
0.27
$0.72×0.3= $
0.216
$25×3.3×0.4= $
33
$7.2÷0.9= $
8
$12.6÷0.9= $
14
$0.99+0.1÷10= $
1
$7.25-2.5= $
4.75
$1.2÷0.04= $
30
$(1-0.01)÷100= $
0.0099
答案
1. 1.36 2. 0.27 3. 1 4. 21 5. 40 6. 3 7. 2.5 8. 10.64x 9. 4a 10. 11.2 11. 0.4 12. 72 13. 6.94 14. 4.82 15. 3.27 16. 0.27 17. 0.216 18. 33 19. 8 20. 14 21. 1 22. 4.75 23. 30 24. 0.0099
二、计算下面各题,怎样简便就怎样计算。
$8.25-3.4+1.75-6.6$
$[1-(0.4+0.45)]÷0.15$
$4.8×9.8+2.4×0.4$
$24×1.05-3.549÷3.9$
$8.25-3.4+1.75-6.6$
$[1-(0.4+0.45)]÷0.15$
$4.8×9.8+2.4×0.4$
$24×1.05-3.549÷3.9$
答案
1. 0 2. 1 3. 48 4. 24.29
解析
8.25-3.4+1.75-6.6
=(8.25+1.75)-(3.4+6.6)
=10-10
=0
[1-(0.4+0.45)]÷0.15
=[1-0.85]÷0.15
=0.15÷0.15
=1
4.8×9.8+2.4×0.4
=4.8×9.8+4.8×0.2
=4.8×(9.8+0.2)
=4.8×10
=48
24×1.05-3.549÷3.9
=25.2-0.91
=24.29
=(8.25+1.75)-(3.4+6.6)
=10-10
=0
[1-(0.4+0.45)]÷0.15
=[1-0.85]÷0.15
=0.15÷0.15
=1
4.8×9.8+2.4×0.4
=4.8×9.8+4.8×0.2
=4.8×(9.8+0.2)
=4.8×10
=48
24×1.05-3.549÷3.9
=25.2-0.91
=24.29
