Tính nhanh
Bài 18:Tính nhanh
a. 274+(158+26) b. 123+132+321+321
c.3.125.121.8 d. 367+129+133+371+17
e.29+123+237+868+763 f. 652=327+148+15+73
g. 25.5.4.31.2 h.37.64+37.36
i. 98.31+62 k.4.7.7.6+28.24 l. 98.31+62l.28.(231+69)+72.(60+240) m. 136.48+16.272+68.20.2
n. 35.34+35.86+65.75+65.45 o. 3.25.8+4.37.6+2.38.12
p. 10+11+12+13+...+99 q.1+6+11+16+....+46+51
r.(1+3+5+7+...+2017) (135135.137-135.137137)
a. 274+(158+26) b. 123+132+321+321
c.3.125.121.8 d. 367+129+133+371+17
e.29+123+237+868+763 f. 652=327+148+15+73
g. 25.5.4.31.2 h.37.64+37.36
i. 98.31+62 k.4.7.7.6+28.24 l. 98.31+62l.28.(231+69)+72.(60+240) m. 136.48+16.272+68.20.2
n. 35.34+35.86+65.75+65.45 o. 3.25.8+4.37.6+2.38.12
p. 10+11+12+13+...+99 q.1+6+11+16+....+46+51
r.(1+3+5+7+...+2017) (135135.137-135.137137)