Câu trả lời:
a,20,18×7,5+20,18+20,18+20,18:2a,20,18×7,5+20,18+20,18+20,18:2
=20,18×7,5+20,18×1+20,18×1+20,18×0,5=20,18×7,5+20,18×1+20,18×1+20,18×0,5
=20,18×(7,5+1+1+0,5)=20,18×(7,5+1+1+0,5)
=20,18×(8,5+1+0,5)=20,18×(8,5+1+0,5)
=20,18×(9,5+0,5)=20,18×(9,5+0,5)
=20,18×10=20,18×10
=201,8 đây nhé bạn