①2.67+5.04+1.9
②21.43-2.74-5.26
③7.49-(0.56+2.8)
④4.8-1.74+2.06
⑤15.25+7.3+4.75+3.7
⑥17.13-3.82-4.06
20.56-4.14+5.86 27.4-(7.4+3.15)-6.85
①8.47+12.53-1.2 ②50-19.8-20.2 ③19.4+4.58+5.42
①6000÷25
②73.2+27.3+72.7
③42.5-16.41-3.59
④29.46-(5.8-0.08)
⑤65×[(500-32)÷18]
0.69+2.83+0.17 73.65-(7.92+3.65) 23.8-13.72+6.2-12.28
5.4+0.74+4.6=5.4++0.74
4.04+13.57+2.43=4.04+(◯)
48.72-0.2-0.8=48.72-(◯)
4.094.009 5元6.2元 8.1+0.20.2+8.1
0.50.500 6.32m6.23m 10-2.7-2.310-(2.7-2.3)
2.3+5.4+8.7+3.6=( ◯ )◯( ◯ )
=4.5++5.95
运用了( )律。
=12.6+(+)
运用了( )律和( )律。
=13.27-()
运用了( )。
=7.8