3个回答
展开全部
①-(3/5)²+9/25×(-24)=-9/25+9/25×(-24)=-9/25×(-1-24)=-9/25×(-25)=9, ②6.1²+12.2×3.9+3.9²=6.1^2+2×6.1×3.9+3.9^2=(6.1+3.9)^2=10^2=100
追答
①-(3/5)²+9/25×(-24)=-9/25+9/25×(-24)=9/25×(-1-24)=9/25×(-25)=-9, ②6.1²+12.2×3.9+3.9²=6.1^2+2×6.1×3.9+3.9^2=(6.1+3.9)^2=10^2=100
展开全部
①-(3/5)²+9/25×(-24)
=-9/25-9/25x24
=(-9/25)x(1+24)
=-9/25x25
=-9
②6.1²+12.2×3.9+3.9²
=(6.1+3.9)²
=10²
=100
=-9/25-9/25x24
=(-9/25)x(1+24)
=-9/25x25
=-9
②6.1²+12.2×3.9+3.9²
=(6.1+3.9)²
=10²
=100
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