72 nhân 10 + 72 - 216 + 144
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\(36\text{×}5+72\text{×}2-216+144\)
\(=36\text{×}5+36\text{×}2\text{×}2-36\text{×}6+36\text{×}4\)
\(=36\text{×}5+36\text{×}4-36\text{×}6+36\text{×}4\)
\(=36\text{×}\left(5+4-6+4\right)=36\text{×}7=252\)
`= 72 xx 19 + 36 xx 2 xx3 xx 10 + 72 xx 80 - 72 xx 29`
`= 72 xx(19 + 30 - 29 + 80)`
`= 72 xx 100`
`= 7200`
\(=72.19+36.2.3.10+72.2.40-72.29\)
\(=72.19+72.30+72.80-72.29\)
\(=72.\left(19+30+80-29\right)\)
\(=72.100=7200\)
1368+216×10+576+2088
1368+2160+576-2088
3528+576-2088
4104-2088
2016
\(\text{a) -72+ (154+76) }\)
\(=-72+230\)
\(=158\)
\(\text{b) (144-97) -144 }\)
\(=47-144\)
\(=-97\)
\(\text{c) -145- (-18-145) }\)
\(=-145-\left(-163\right)\)
\(=18\)
\(\text{d) 38-(12+13+14) }\)
\(=38-39=-1\)
\(\text{e)-144-(29-144-144) }\)
\(=-144-\left(-259\right)=115\)
\(-72+\left(154+74\right)\)
\(=\left(-72\right)+230\)
\(158\)
\(\left(144-97\right)-144\)
\(=47-144\)
\(=-97\)
\(-145-\left(-18-145\right)\)
\(=\left(-145\right)-\left(-163\right)\)
\(=18\)
\(38-\left(12+13+14\right)\)
\(=38-39\)
\(=-1\)
\(-144-\left(19-144-144\right)\)
\(=\left(-144\right)-\left(-259\right)\)
\(=115\)
kết quả=720