口算。20×6= 35×20= 23×30= 20×18=

1. 口算。
20×6=      35×20=      23×30=    20×18=      15×10=
51×12=     5-2.3=      6.1-5.8=     13.5+10=    8.3+6.7=
14.8+1.5=   5.3-1.9=       $\text{[math]}$ - $\text{[math]}$ =      $\text{[math]}$ + $\text{[math]}$ =
1- $\text{[math]}$ =         $\text{[math]}$ + $\text{[math]}$ =       $\text{[math]}$ + $\text{[math]}$ =     1- $\text{[math]}$ =

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1. 口算。20×6= 35×20= 23×30= 20×18= 15×10=51×12= 5-2.3= 6.1-5.8= 13.5+10= 8.3+6.7=14.8+1.5= 5.3-1.9= - = + =1- = + = + = 1- =