81․ Հաշվի՛ր 

ա)2324×72=167328                   բ)8452×62=624024                   գ )2500×260=620000 

 6540×840=5493600                     1180×340=401200                   1200×320=38400 

 

  1. Հաշվիր արտահայտության արժեքը, եթե a 3400

ա)2458x(a-3339)=149938                       1647x(a-3400)=0 

1)3400-3339=61                                         1)3400-3400=0  

2)2458×61=149938                                    2)1647×0=0 

                                                 բ) 

5642x(a-3352)=270816                            9999:(a-3399)=9998                     

1)3400-3352=48                                        1)3400=3399=1 

2)5642×48=270816                                   2)9999-1=9998