tinh nhanh
70+50+30+50+26+97+3+74
=(70+30)+(50+50)+(97+3)+(74+26)
=100+100+100+100
=400
209-134
56+78=134
78+97=175
145-74=71
12+56-34+89=68-34+89=34+89=123
70+50+30+50+26+97+3+74=(70+30)+(50+50)+(26+74)+(97+3)=100+100+100+100=400
209-134=75
210-73=137
134 175 71 191
56+78 = 134
78 + 97= 175
145 - 74=71
12+56-34+89=191
56 + 78 = 134
78 + 97 = 175
145 - 74 = 71
12 + 56 - 34 + 89 = 123
70 + 50 + 30 + 50 + 26 + 97 + 3 + 74
= ( 70 + 30 ) + ( 50 + 50 ) + ( 26 + 74 ) + ( 97 + 3 )
= 100 + 100 + 100 + 100
= 400
209 - 134 = 75
210 - 73 = 137
56 + 78 = 134
78 + 97 = 175
145 - 74 = 71
12 + 56 - 34 + 89 = 123
70 + 50 + 30 + 50 + 26 + 97 + 3 + 74
=(70 + 30)+(50 + 50)+(26 + 74)+(97 + 3)
= 100 + 100 + 100 + 100
= 400
209 - 134 = 75
210 - 73 = 137
\(56+78=134\)
\(78+97=175\)
\(145-74=71\)
\(12+56-34+89=123\)
\(70+50+30+50+26+97+3+74\)
\(=\left(70+30\right)+\left(50+50\right)\left(26+74\right)+\left(97+3\right)\)
\(=100+100+100+100\)
\(=400\)
\(209-134=75\)
\(210-73=137\)
