a) −34.12−5.(−256)−34.12−5.(−256)
b) (−2).−3821.−74.(−38)(−2).−3821.−74.(−38)
c) (1112:3316).35(1112:3316).35
d) 723.[(−86)−4518]
tính cách thuận tiện nha
Tính - 2 . - 38 21 . - 7 4 . - 3 8
Đề bài
Tính
a) −34.12−5.(−256)−34.12−5.(−256)
b) (−2).−3821.−74.(−38)(−2).−3821.−74.(−38)
c) (1112:3316).35(1112:3316).35
d) 723.[(−86)−4518]
Nhân hai số hữu tỉ: ( − 2 ) ⋅ − 38 21 ⋅ − 7 4 ⋅ − 3 8
( − 2 ) ⋅ − 38 21 ⋅ − 7 4 ⋅ − 3 8 = ( − 2 ) . ( − 38 ) . ( − 7 ) . ( − 3 ) 21.4.8 = 2.38.7.3 21.4.8 = 19 8 = 2 3 8
Tính: - 3 4 . 12 - 5 . - 25 6
34.12 + 34.88 tính một cách thuận tiện
34.12 + 34.88
= 34 . (12+88)
= 34 . 100
= 3400
Tính bằng cách thuận tiện nhất
37/35:5/4:74/25 =
\(\frac{37}{35}:\frac{5}{4}:\frac{74}{25}\)
\(=\frac{37}{35}:\left(\frac{5}{4}\times\frac{74}{25}\right)\)
\(=\frac{37}{35}:\frac{37}{10}\)
\(=\frac{2}{7}\)
\(\frac{37}{35}:\frac{5}{4}:\frac{74}{25}\)
=\(\frac{37}{35}x\frac{4}{5}x\frac{25}{74}\)
\(=\left(\frac{37}{35}x\frac{25}{74}\right)x\frac{4}{5}\)
\(=\frac{1}{7}x\frac{5}{2}x\frac{4}{5}\)
\(=\frac{1x5x2x2}{7x2x5}\)
\(=\frac{2}{7}\)
\(\frac{37}{35}:\frac{5}{4}:\frac{74}{25}\)
\(=\frac{37}{35}:\frac{74}{25}:\frac{5}{4}\)
\(=\frac{37}{35}\times\frac{25}{74}\times\frac{4}{5}\)
\(=\frac{37\times25\times4}{35\times74\times5}\)
\(=\frac{37\times5\times5\times2\times2}{5\times7\times37\times2\times5}\)
\(=\frac{2}{7}\)
~ Thiên Mã ~
Tính:
a) 9 36 − 7 − 35
b) 5 − 4 3
c) − 11 12 − ( − 1 )
Bài 1: Tìm x
a) (2x+5)^2=196
b) (-3x+1)^2=25
c) ( x+1)^3=-27
d) (x^2-9) . (x^2+1)=0
Bài 2 : Tính nhanh
a) -25 .68+(-34).(-256)
b) -35(45-74)-74 . (35+45)
c) (-2)^5 . 30 +(-2)^5 . 69+(-32)
d) 25.(32+47)-32 . ( 25+47)
CẦN GẤP !!!!!!!! AI NHANH TICK CHO...
Tính:
a ) 19 6 − 2 6 ; b ) − 3 5 − 5 6 ; c ) − 5 9 − − 5 12 d ) 9 36 − 7 − 35 ; e ) 5 − 4 3 ; f ) − 11 12 − ( − 1 )
a ) 17 6 b ) − 43 30 c ) − 5 36
d ) 9 20 . e ) 11 3 . f ) 1 12