а) 124,09+56,01=(124+56)+(0,09+0,01)=180+1=181 56,01+124,09=(56+124)+(0,1+0,9)=180+1=181
б) 3,92+(34,33+6,08)=(3,92+6,08)+34,33=10+34,33=44,33 (3,92+34,33)+6,08=(3,92+6,08)+34,33=10+34,33=44,33
в) 15,239-(4,009+5,23)=(15,239-4,009)-5,23=11,23-5,23=6
15,239-4,009-5,23=11,23-5,23=6
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а) 124,09+56,01=(124+56)+(0,09+0,01)=180+1=181 56,01+124,09=(56+124)+(0,1+0,9)=180+1=181
б) 3,92+(34,33+6,08)=(3,92+6,08)+34,33=10+34,33=44,33 (3,92+34,33)+6,08=(3,92+6,08)+34,33=10+34,33=44,33
в) 15,239-(4,009+5,23)=(15,239-4,009)-5,23=11,23-5,23=6
15,239-4,009-5,23=11,23-5,23=6