Tính bằng cách thuận tiện:
a) 81 + 243 + 19
b) 4.17.25
c) 24.67 + 24.33
d) 17.85 + 15.17 - 120
Thực hiện các phép tính: 17.85 + 15.17 – 120
17.85 + 15.17 – 120 = 17.(85 + 15) – 120 = 17.100 – 120 = 1700 – 120 = 1580
17.85+15.17-120
\(17.85+15.17-120\)
\(=17.\left(15+85\right)\)\(-120\)
\(=17.100-120\)
\(=1700-120\)
\(=1580\)
17.85+15.17-120
=17.(15+85)-120
=17.100-120
=1700-120
=1580
K cho mk nha
17 . 85 + 15 . 17 - 120
= 17 . ( 85 + 15 ) - 120
= 17 . 100 - 120
= 1700 - 120
= 1680
17.85+15.17-120
17.85 + 15.17 - 20
= 17.(85 + 15) - 20
= 17.100 - 20
= 1700 - 20
= 1680
17.85+15.17-120
17.85+15.17-120
=1445+255-120
=1700-120
=1580
17.85+15.17-120
17 . ( 85 + 15 ) - 120
=17 . 100 - 120
=1700 - 120
=1580
17.85+15.17-120
17 . 85 + 15 . 17 - 120
= 17 . (85 + 15) - 120
= 17 . 100 - 120
= 1700 - 120
= 1580
17.85+15.17-120
=17.(85+15)-120
=17.100-120
=1700-120
=1580
(17.85+15.17)+(-120)
help me
(17.85 + 15.17) + (-120)
= 17.85 + 15.17 + (-120)
= 17.(85 + 15) + (-120)
= 17.100 + (-120)
= 1700 + (-120)
= 1580
(17.85+15.17)+(-120)
=((17.(85+15))+(-120)
=17.100+(-120)
=1700+(-120)
=1580
(17.85+15.17) +(-120)
= (1445+255)-120
=1700-120
=1580
Thực hiện phép tính[ tính nhanh nếu có thể]
a/17.85+15.17-120
17.85 + 15.17 - 120
= 1445 + 255 -120
=1700 - 120
=1580
a/17.85+15.17-120
=120.[(17-17).(85+15)]
=120. 0
=0
17.85+15.17-120
=[85+15].17-120
=100.17-120
=1700-120
=1480
Thực hiện phép tính:
a, 5 . 2 2 - 18 : 3 2
b, 17.85+15.17 – 120
c, 2 3 . 17 - 2 3 . 14
d, 20 – [30 – 5 - 1 2 ]
a, 5 . 2 2 - 18 : 3 2
= 5.4 – 18:9
= 20 – 2 = 18
b, 17.85+15.17 – 120
= 1445+255 – 120
= 1580
c, 2 3 . 17 - 2 3 . 14
= 2 3 . ( 17 - 14 ) = 8.3 = 24
d, 20 – [30 – 5 - 1 2 ]
= 20 – (30 – 16) = 6
17.85+15.17-120+20120
17.85+15.17-120+20120
=17.(85+15)-120+1
=17.100-120+1
=1700-120+1
=1580+1
=1581
17×85+15×17-120+20120
= (17×85)+(15×17)-(120+20120)
= 1445 +225-121
=1579