Câu hỏi của Trịnh phương linh

Question

Tính hợp lí:a) 5 . 11 . 18 + 9 . 31 . 10 + 4 . 29 . 45b) 37 . 39 + 78 . 14 + 13 . 85 + 52 . 55 Mình cần gấp !

Đỗ Chí Phong · Accepted Answer

a)5.11.18+9.31.10+4.29.455.11.18+9.31.10+4.29.45=90.11+90.31+2.29.90=90.11+90.31+2.29.90=90.(11+31+2.29)=90.(11+31+2.29)=90.100=9000b)37.39+78.14+13.85+52.5537.39+78.14+13.85+52.55=37.39+39.2.14+13.5.17+13.4.5.11=37.39+39.2.14+13.5.17+13.4.5.11=39.(37+2.14)+65.17+65.44=39.(37+2.14)+65.17+65.44=39.65+65.(17+44)=39.65+65.(17+44)=39.65+65.61=39.65+65.61=65.(39+61)=65.(39+61)=65.100=6500Câu trả lời: a)5.11.18+9.31.10+4.29.455.11.18+9.31.10+4.29.45=90.11+90.31+2.29.90=90.11+90.31+2.29.90=90.(11+31+2.29)=90.(11+31+2.29)=90.100=9000b)37.39+78.14+13.85+52.5537.39+78.14+13.85+52.55=37.39+39.2.14+13.5.17+13.4.5.11=37.39+39.2.14+13.5.17+13.4.5.11=39.(37+2.14)+65.17+65.44=39.(37+2.14)+65.17+65.44=39.65+65.(17+44)=39.65+65.(17+44)=39.65+65.61=39.65+65.61=65.(39+61)=65.(39+61)=65.100=6500

Phạm Trần Nguyên Anh · Answer

a.(5.18).11+(9.10).31+2.2.29.45=90.11+90.31+(2.45).2.29=90.11+90.31+90.2.29=90.(11+31+2.29)=90.100=9000Câu trả lời: a.(5.18).11+(9.10).31+2.2.29.45=90.11+90.31+(2.45).2.29=90.11+90.31+90.2.29=90.(11+31+2.29)=90.100=9000

Nguyễn Thị Anh Đào · Answer

a)

5.11.18+9.31.10+4.29.455.11.18+9.31.10+4.29.45

=90.11+90.31+2.29.90=90.11+90.31+2.29.90

=90.(11+31+2.29)=90.(11+31+2.29)

=90.100=9000

b)

37.39+78.14+13.85+52.5537.39+78.14+13.85+52.55

=37.39+39.2.14+13.5.17+13.4.5.11=37.39+39.2.14+13.5.17+13.4.5.11

=39.(37+2.14)+65.17+65.44=39.(37+2.14)+65.17+65.44

=39.65+65.(17+44)=39.65+65.(17+44)

=39.65+65.61=39.65+65.61

=65.(39+61)=65.(39+61)

=65.100=6500Câu trả lời: a)