问题 解答题

化简:7a2b-{3[4(0.5a2b-2.5abc-1)-2(a2b-5abc)]+7a2b}+5.

答案

7a2b-{3[4(0.5a2b-2.5abc-1)-2(a2b-5abc)]+7a2b}+5,

=7a2b-{3[2a2b-10abc-4-2a2b+10abc]+7a2b}+5,

=7a2b-{6a2b-30abc-12-6a2b+30abc+7a2b}+5,

=7a2b-6a2b+30abc+12+6a2b-30abc-7a2b+5

=17;

问答题
多项选择题