А)-(9.8+6.9)-(10,2-6.9) б)(1.59+3.47)-(2.47+0.59) в)(1.9+2.5)-(5.9-2.5) г)(0.85+1.5)-(-0.65-3.5)
А)-(9.8+6.9)-(10,2-6.9)=-9,8-6,9-10,2+6,9=-20;///б)(1.59+3.47)-(2.47+0.59)=1,59+3,47-2,48-0,59=1,99;////в)(1.9+2.5)-(5.9-2.5)=1,9+2,5-5,9+2,5=1;////г)(0.85+1.5)-(-0.65-3.5)=0,85+1,5+0,65+3,5=6,5
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