bài 1 tính nhanh ạ, 150 -34+44-66-50 b, 125 -36+25-75
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A. 150 - 34 + 44 - 66 - 50 = (150 - 50 ) - ( 34 + 66 ) + 44 = 100 - 100 + 44 = 44
B. 125 - 36 + 25 - 74 = (125 + 25 ) - (36 + 74 ) = 150 - 110 = 40
(45+75)*66+(75+45)*34
=(45+75)*(66+34)
=120*100
=12000
11+22+33+44+55+66+77+88+99:11
=11+22+33+44+55+66+77+88+9
=(11+9)+(22+88)+(33+77)+(44+66)+55
=20+110*3+55
=20+330+55
=405
Ta có :
a, (45 + 75) x 66 + (75 + 45) x 34
= (45 + 75) x (66 + 34)
= 120 x 100
= 12000
11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 99 : 11
= 33 + 77 + 121 + 165 + 9
= 405
a) \(48.19+48.15+134.52\)
\(=48\left(19+15\right)+6968\)
\(=48.34+6968\)
\(=1632+6968\)
\(=8600.\)
b) \(27.121-87.27+73.34\)
\(=27\left(121-87\right)+73.34\)
\(=27.34+73.34\)
\(=34\left(27+73\right)\)
\(=34.100\)
\(=3400.\)
c) \(125.98-125.46-52-25\)
\(=125\left(98-46\right)-52-25\)
\(=125.52-52-25\)
\(=52\left(125-1\right)-25\)
\(=52.124-25\)
\(=6448-25\)
\(=6423.\)
d) \(136.23+136.17-40.36\)
\(=136\left(23+17\right)-40.36\)
\(=136.40-40.36\)
\(=40\left(136-36\right)\)
\(=40.100\)
\(=4000.\)
e) \(66.25+5.66+66.14+33.94\)
\(=33\left(2.50+5.2+14.2+94\right)\)
\(=33\left(50+10+28+94\right)\)
\(=33.182\)
\(=6006.\)
a, = 996 + 4 + 40 = 1000 + 40 = 1040
b, = 198 + 2 + 35 = 200 + 35 = 235
c, = ( 4 *25 )*(2 * 5)*55=100 * 10 * 55 = 55000
d, = 97*(36+64) = 97 * 100 = 9700
e, = (125+75)+(360+40)= 200 + 400 = 600
g, =10^2=100
a) 150 - 34 + 44 - 66 - 50
= (150 - 50) + (44 - 34) - 66
= 100 + 10 - 66
= 110 - 66
= 44
b) 152 - 36 + 25 - 75
= (152 - 36) + (75 - 25)
= 116 + 50
= 166
a 150-34+44-66-50=44
b 125-36+25-75=39