12 + 24 = ????
78 - 55 = ????
78 x 31 + 78 x 24 + 55 x 22
78 x 31 + 78 x 24 + 55 x 22
= 78 x ( 31 + 24 ) + 55 x 22
= 78 x 55 + 55 x 22
= 55 x ( 78 + 22 )
= 55x 100
= 5500
\(78.31+78.24+55.22\)
\(=78.\left(31+24\right)+55.22\)
\(=78.55+55.22\)
\(=55.\left(78+22\right)\)
\(=55.100\)
\(=5500\)
78 x 31 + 78 x 24 + 55 x 22
= 78 x (31 + 24) + 55 x 22
= 78 x 55 + 55 x 22
= 55 x (78 + 22)
= 55 x 100
= 5 500
Chúc bạn học tốt!
78+89=
12*24=
87:29=
129-55=
Ai nhanh nhất mik tk cho!trả lời cụ thể,rõ ràng ra
78 + 89 = 167
12 x 24 = 288
87 : 29 = 3
129 - 55 =124
Tính hợp lí
a. (-256).43+(-256).25-256.32
b. 48.(-21)+(-142).(-24)
c. (-55).78+13+(-78)-78.(-65)
a.(-256).43+(-256).25-256.32
=(-256).43+(-256).25+(-256).32 =(-256).(43+25+32)
=(-256).100
-25600
Hiệu sau tận cùng là chữ số nào
78 x 18 x 45 x 72 - 24 x 21 x 55 x 60
hi bạn
đây nha
Vũ hữu Tuấn cảm ơn bạn nhé.
sin^2 12+sin^2 20 -sin^35 -sin^2 55 +sin^2 70 +sin^2 78
\(\sin^212+\sin^220-\sin^235-\sin^255+\sin^270+\sin^278\)
\(=\cos^278+\cos^280-\cos^255-\sin^255+\sin^270+\sin^278\)
\(=1+1-1=1\)
`(-134)+51.134+(-134).48
124+(-52).124+(-124).(-47)
-55.78+13.(-78)-78.(-65)
45.(-24)+(-10).(-12)
12 - 3 = ? + 96 = ? + 10 + 1 + ?
100 - 55 = ?
12 ? 3 = 4 x 4 = ?
99 : 3 = ?
78 + 32 = ?
12-3=9+96=105+10+1=116
100 - 55=45
12:3=4 *4=16
99 :3=33
78+32=110
Tính : 11 + 67 × 24 + 12 + 55 - 24 = ?
11 + 67 x 24 + 12 + 55 - 24
= 11 + 55 + 67 x 24 - 24 + 12
= 66 + 24 x (67 - 1) + 12
= 66 + 24 x 66 + 12
= 66 x (24 + 1) + 12
= 66 x 25 + 12
= 1650 + 12
= 1662
11 + 67 x 24 + 12 + 55 - 24
= 11 + 55 + 24 x ( 67 - 1) + 12
= 66 + 24 x 66 + 12
= 66 x ( 1 + 24 ) + 12
= 66 x 25 + 12
= 1650 + 12
= 1662
tính nhanh
a.-55.78+13.(-78)-78.(-65)
b.45.(-24)+(-10).(-12)
\(a,-55.78+13\left(-78\right)-78.\left(-65\right)\)
\(=78\left(-55-13+65\right)\)
\(=78.\left(-3\right)\)
\(=-234\)
\(b,45\left(-24\right)+\left(-10\right).\left(-12\right)\)
\(=-90.\left(-12\right)+\left(-10\right).\left(-12\right)\)
\(=-12\left(-90-10\right)\)
\(=-12.\left(-100\right)\)
\(=1200\)
a) \(-55.78+13.\left(-78\right)-78.\left(-65\right)\)
\(=\left(55+13-65\right).\left(-78\right)\)
\(=-234\)
b) \(45.\left(-24\right)+\left(-10\right).\left(-12\right)\)
\(=45.\left(-24\right)+\left(-10\right):2.2.\left(-12\right)\)
\(=45.\left(-24\right)+\left(-5\right).\left(-24\right)\)
\(=\left(-24\right).\left(45-5\right)\)
\(=-960\)