一定要人工,答题完整.合并同类项(1)3a²+a²-(2a²-2a)+(3a-a²)(2)-3(2x²-xy)+4(x²+xy-6)(3)2(2a²+9b)+3(-5a²-4b)
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一定要人工,答题完整.合并同类项(1)3a²+a²-(2a²-2a)+(3a-a²)(2)-3(2x²-xy)+4(x²+xy-6)(3)2(2a²+9b)+3(-5a²-4b)
一定要人工,答题完整.
合并同类项
(1)3a²+a²-(2a²-2a)+(3a-a²)
(2)-3(2x²-xy)+4(x²+xy-6)
(3)2(2a²+9b)+3(-5a²-4b)
一定要人工,答题完整.合并同类项(1)3a²+a²-(2a²-2a)+(3a-a²)(2)-3(2x²-xy)+4(x²+xy-6)(3)2(2a²+9b)+3(-5a²-4b)
1)3a²+a²-(2a²-2a)+(3a-a²)
=3a²+a²-2a²+2a+3a-a²
=a²+5a
(2)-3(2x²-xy)+4(x²+xy-6)
=-6x²+3xy+4x²+4xy-24
=-2x²+7xy-24
(3)2(2a²+9b)+3(-5a²-4b)
=4a²+18b-15a²-12b
=-11a²+6b
(1)原式=4a²-2a²+2a+3a-a²
=a²+5a
(2)原式=-6x²+3xy+4x²+4xy-24
=-2x²+7xy-24
(3)原式=4a²+18b-15a²-12b
=-11a²+6b
= =||很简单啊
(1)=3a²+a²-2a²+2a+3a-a²
=a²+5a
(2)=-6x²+3xy+4x²+4xy-24
=7xy-2x²-24
(3)=4a²+18b-15a²-12b
=-11a²+6b
=6b-11a²
1)原式=3a²+a²-2a²-a²+2a+3a=a²+5a
2)原式=-6x²+3xy+4x²+4xy-24=-2x²+7xy-24
3)原式=4a²+18b-15a²-12b=-11a²+6b
希望对你有所帮助
(1)=4a²-2a²+2a+3a-a²
=2a²+5a-a²
=a²+5a
(2)-6a²+3xy+4a²+xy-6
=-2a²+4xy-6
(3)4a²+18b-15a²-4b
=-11a²+14b
(1)3a2+a2-(2a2-2a)+(3a-a2)
=3a2+a2-2a2+2a+3a-a2
=(3+1-2-1)a2+(2+3)a
=a2+5a
(2)-3(2x2-xy)+4(x2+xy-6)
=-6x2+3xy+4x2+4xy-24
=(-6+4)x2+(3+4)xy-24
=-2x2+7xy-24
(...
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(1)3a2+a2-(2a2-2a)+(3a-a2)
=3a2+a2-2a2+2a+3a-a2
=(3+1-2-1)a2+(2+3)a
=a2+5a
(2)-3(2x2-xy)+4(x2+xy-6)
=-6x2+3xy+4x2+4xy-24
=(-6+4)x2+(3+4)xy-24
=-2x2+7xy-24
(3)2(2a2+9b)+3(-5a2-4b)
=4a2+18b-15a2-12b
=(4-15)a2+(18-12)b
=-11a2+6b
完全手写输入,选我( ⊙ o ⊙ )啊!
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(1)原式=3a^2+a^2-2a^2+2a+3a-a^2=a^2+5a
(2)原式=-6x^2+xy+4x^2+4xy-24=-2x^2+5xy-24
(3)原式=4a^2+18b-15a^2-12b=-11a^2+6b