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89 - 89 + 12 - 5 + 79 + 85 - 78
= ( 89 - 89 ) + ( 79 - 78 ) + ( 85 - 5 ) + 12
= 0 + 1 + 80 + 12
= 1 + 80 + 12
= 81 + 12
= 93
= 0 + 12 - 5 + 79 + 85 - 78
= 12 - 5 + 79 + 85 - 78
= 7 + 79 + 85 - 78
= 86 + 85 - 78
= 171 - 78
= 93
tk mk nha bạn !
`@` `\text {Ans}`
`\downarrow`
`23 + 23 \times 45 + 23 \times 44`
`= 23 \times (1+45 + 44)`
`= 23 \times 90`
`= 2070`
`b)`
`36 \times 280 - 9 \times 79 \times 4 - 36`
`= 36 \times 280 - 9 \times 4 \times 79 - 36`
`= 36 \times 280 - 36 \times 79 - 36`
`= 36 \times (280 - 79 - 1)`
`= 36 \times 200`
`= 7200`
`c)`
`8 \times 9 \times 10 + 6 \times 25 \times 12 + 4 \times 18 \times 66 - 2 \times 36`
`= 2 \times 4 \times 9 \times 10 + 6 \times 2 \times 6 \times 25 + 2 \times 2 \times 18 \times 66 - 2 \times 36`
`= 10 \times 2 \times 36 + 36 \times 2 \times 25 + 36 \times 2 \times 66 - 2 \times 36`
`= 36 \times 2 \times (10 + 25 + 66 - 1)`
`= 72 \times 100`
`= 7200`
_____
`c)`
`439 \times 78 - 38 \times 78 - 78`
`= 78 \times (439 - 38 - 1)`
`= 78 \times 400`
`= 31200`
`d)`
`24 \times 13 + 6 \times 89 \times 4 - 2 \times 24`
`= 24 \times 13 + 24 \times 89 - 2 \times 24`
`= 24 \times (13 + 89 - 2)`
`= 24 \times 100`
`= 2400`
\(\frac{37}{89}\)\(\frac{38}{89}\)\(\frac{78}{89}\)\(\frac{37}{98}\)
\(\frac{12}{17}\)\(\frac{14}{17}\)\(\frac{18}{17}\)\(\frac{12}{19}\)
\(\frac{49}{60}\)\(\frac{5}{6}\)\(\frac{4}{5}\)\(\frac{3}{4}\)
500 - 89 + 90 - 158 + 1
= 411 + 90 - 158 + 1
= 501 - 158 + 1
= 343 + 1
= 344
a) 7890 kg = .....7,89..... tấn
b) 4m³ 59dm³ = .....4,59..... m
HT tick nha:}}
212121/89=2383,382022....
2345/78=30,0(641025)=30,0641025641025...
7890/90=87,(6)=87,66666666...
\(\frac{212121}{89}=2383,3820..\)
\(\frac{2345}{78}=30,0641...\)
\(\frac{7890}{90}=\frac{263}{3}=87,667\)