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1、求未知加数求未知加数1开火车,算一算开火车,算一算3 + 4 = 5 + 5 = 7 + 3 = 7 2 = 5 + 4 = 6 + 3 = 4 + 4 = 3 + 7 =8 6 = 6 + 4 = 8 5 = 10 5 =5 + 5 = 10 6 = 8 + 2 = 7 + 2 =5 + 3 = 10 3 = 10 1 = 2 + 7 = 710105998101010102847359992开火车,算一算开火车,算一算9 95 510103 310105 510102 210101 110106 6474895345你是怎样想你是怎样想的呢?的呢?8 + ( )= 10再放几个是再放几个是
2、1010个个?8 8101010 8 = 222未知数未知数例例6 再放再放几个几个就是就是 10个个? 8 +( )=10271 1、看图填数、看图填数2 2、用加法、用加法3 3、用减法、用减法4 4、用分与合、用分与合81、5+( )=8( )+6=107+( )=83+( )=9361499+( )=103+( )=105+( )=92、看算式,画画填填。174103、114、2 +( )=10( )+ 9 =10( 4)+ 3 =74 +( )=9815125、97531136、105 142+( )=102+( )=106+( )=96+( )=9( )+5 =9( )+5 =96
3、+( )=66+( )=63+( )3+( )5 5( )+4( )+47 72+( )=3+42+( )=3+43152+( )=102+( )=106+( )=96+( )=9( )+5 =9( )+5 =96+( )=66+( )=63+( )3+( )5 5( )+4( )+47 72+( )=3+42+( )=3+44162+( )=102+( )=106+( )=96+( )=9( )+5 =9( )+5 =96+( )=66+( )=63+( )3+( )5 5( )+4( )+47 72+( )=3+42+( )=3+48172+( )=102+( )=106+( )=96+(
4、 )=9( )+5 =9( )+5 =96+( )=66+( )=63+( )3+( )5 5( )+4( )+47 72+( )=3+42+( )=3+40182+( )=102+( )=106+( )=96+( )=9( )+5 =9( )+5 =96+( )=66+( )=62+( )=3+42+( )=3+4( )+4( )+47 72+( )=3+42+( )=3+42+( )=72+( )=755( )+ 3 = 5 + 45 + 4 96192+( )=102+( )=106+( )=96+( )=9( )+5 =9( )+5 =96+( )=66+( )=62+( )=3+42+( )=3+4( )+4( )+47 73+( )3+( )5 5210202+( )=102+( )=106+( )=96+( )=9( )+5 =9( )+5 =96+( )=66+( )=63+( )3+( )5 5( )+4( )+47 73+( )3+( )5 5.654321再见!22