1.看谁算得又对又快。
2.1+1.9= 5.8+2.9= 5.7+0.2=
7.54+6.4= 2.31+0.7= 2.7+4.3=
2.1+1.9= 5.8+2.9= 5.7+0.2=
7.54+6.4= 2.31+0.7= 2.7+4.3=
答案:
4 8.7 5.9
13.94 3.01 7
13.94 3.01 7
2.简便计算。
2.58+6.5+7.42 65.27+9.09+35.73 53.09+15.8+6.91
8.42−2.7+1.58 51.88−50.9+6.02 70.38−34.9+29.62
82+60.1+18.9 44.5+4.07+5.93 11.85+9.57+0.43
2.58+6.5+7.42 65.27+9.09+35.73 53.09+15.8+6.91
8.42−2.7+1.58 51.88−50.9+6.02 70.38−34.9+29.62
82+60.1+18.9 44.5+4.07+5.93 11.85+9.57+0.43
答案:
2.58+6.5+7.42
=(2.58+7.42)+6.5
=10+6.5
=16.5
65.27+9.09+35.73
=(65.27+35.73)+9.09
=101+9.09
=110.09
53.09+15.8+6.91
=(53.09+6.91)+15.8
=60+15.8
=75.8
8.42−2.7+1.58
=(8.42+1.58)−2.7
=10−2.7
=7.3
51.88−50.9+6.02
=(51.88+6.02)−50.9
=57.9−50.9
=7
70.38−34.9+29.62
=70.38+29.62−34.9
=100−34.9
=65.1
82+60.1+18.9
=82+(60.1+18.9)
=82+79
=161
44.5+4.07+5.93
=44.5+(4.07+5.93)
=44.5+10
=54.5
11.85+9.57+0.43
=11.85+(9.57+0.43)
=11.85+10
=21.85
=(2.58+7.42)+6.5
=10+6.5
=16.5
65.27+9.09+35.73
=(65.27+35.73)+9.09
=101+9.09
=110.09
53.09+15.8+6.91
=(53.09+6.91)+15.8
=60+15.8
=75.8
8.42−2.7+1.58
=(8.42+1.58)−2.7
=10−2.7
=7.3
51.88−50.9+6.02
=(51.88+6.02)−50.9
=57.9−50.9
=7
70.38−34.9+29.62
=70.38+29.62−34.9
=100−34.9
=65.1
82+60.1+18.9
=82+(60.1+18.9)
=82+79
=161
44.5+4.07+5.93
=44.5+(4.07+5.93)
=44.5+10
=54.5
11.85+9.57+0.43
=11.85+(9.57+0.43)
=11.85+10
=21.85
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