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a) 30 : 5 x 2 = 6 x 2 = 12 | b) 24 + 5 x 6 = 24 + 30 = 54 | c) 30 – 18 : 3 = 30 – 6 = 24 |
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(1+29)+(2+28)+(3+27)+(4+26)+(5+25)+(6+24)+(7+23)+(8+22)+(9+21)+(10+20)+(11+19)+(12+18)+(13+17)+(14+16)+15
=30+30+30+30+30+30+30+30+30+30+30+30+30+30+15
=30x14+15
=435
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69339/3=23113 co tat ca so so hang la
16547/2=8273.5 (40-1)*1+1=40
86428/4=21607 tong day so la 25837/3=8612.3 (40+1)*40/5=820
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a. `306xx 18-306 xx 8=306 xx (18-8) =306 xx 10=3060`
b. `9 xx 9+25xx9 +33 xx18`
`=9 xx9 + 25 xx 9 + 33 xx 2 xx 9`
`=9x (9+25+33xx2)`
`=9 xx (9+25+66)`
`=9 xx 100`
`=900`
a) \(306\cdot18-306\cdot8=306\cdot10=3060\)
b) \(9\cdot9+25\cdot9\cdot33\cdot18=9\cdot9\cdot\left(1+25\cdot33\cdot2\right)=81\cdot1651=133731\)
=58-24
=34
=25-24+33
=1+33
=34