Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a, (-72).(15 - 49) + 15.(-56 + 72)
= -72 . 15 + 72.49 - 15.56 + 15.72
= (-72.15 + 15.72) + (72.49 - 15.56)
= 3528 - 84
= 2688
1b, 1532 + (-186) + (-1432) + (-14) + 123
= (1532 - 1432) - (186 + 14) + 123
= 100 - 200 + 123
= 223 - 200
= 23
\(a,\left(-113\right)+55+113-155=\left(-113+133\right)+\left(55-155\right)=0+\left(-100\right)=-100\\ b,-25.17+17.\left(-75\right)=17\left[\left(-25\right)+\left(-75\right)\right]=17.\left(-100\right)=-1700\)
\(c,6^8:6^6-3\left[\left(-53\right)-\left(-21-53\right)\right]+2022^0\\ =6^2-3\left(-53+21+53\right)+1\\ =36-3.21+1\\ =36-63+1\\ =-26\)
a(-113) + 55 + 113 - 155
=>(-113)+ 113+(55 - 155)
=>-100
b -25.17+17.(-75)
=>17(-25-75)
=>17. (-100)
=>-1700
c 68 : 66-3 [( -53) - ( -21 -53 )] + 20220
=>62- 3[ -53 +21 +53 )]+1
=>36−3.21+1
=>36−63+1
=>−26
\(2040-\left[10\left(4^3-56\right):2^3+2^3\right].2022^0\)
\(=2040-\left[10.8:2^3+2^3\right].1\)
\(=2040-\left(10+2^3\right)\)
\(=2040-18=2022\)
2040−[10(43−56):23+23].202202040−[10(43−56):23+23].20220
=2040−[10.8:23+23].1=2040−[10.8:23+23].1
=2040−(10+23)=2040−(10+23)
=2040−18=2022
a: \(\left(-150\right):\left(-5\right)-2\cdot5^2\)
\(=\dfrac{150}{5}-2\cdot25\)
=30-50
=-20
b: \(2040-\left[10\cdot\left(4^3-46\right):18+2^3\right]\cdot2022^0\)
\(=2040-\left[10\cdot\left(64-46\right):18+8\right]\)
\(=2040-\left[10\cdot18:18+8\right]\)
\(=2040-10-8=2030-8=2022\)
1. Thực hiện phép tính bằng cách hợp lí :
a) (-46) + (-125) + 46 + 25 = [(-46)+46] + [(-125)+25]
= 0+(-100) = -100
b) 25.(-15) + 25.(-5) + (-20).75 = 25.[(-15)+(-5)] + (-20).75
= 25.(-20) + (-20).75 = (-20).(25+75) = (-20).100 = -2000
c) (-151)+(-37)+(-42)+(-63)+142 =(-151)+[(-37)+(-63)]+[(-42)+142]
= (-151) + [(-100) + 100] = -151
d)32+(-149)+(-311)+(-89)+(-51) = 32+[(-149)+(-51)] + [(-311)+(-89)]
= 32+[(-200)+(-400)] = 32+(-600) = -568
e)-65.(87-17)-87.(17-65) = (-65).87 - (-65).17 - 87.17 + 87.65
= (-65).87 + 65.17 - 87.17 + 87.65 = [(-65).87+87.65] + 65.(17-87)
= 65.(-70) = -4550
g) -43.(53-16) - 53.(16-43) = (-43).53 - (-43).16 - 53.16 + 53.43
= (-43).53 + 43.16 - 53.16 + 53.43 = [(-43).53+53.43] + 16.(43-53)
= 16.(-10) = -160
Câu 10:
\(a,y\times7+y\times3=70\\ \Rightarrow y\times\left(7+3\right)=70\\ \Rightarrow y\times10=70\\ \Rightarrow y=7\\ b,18:y+12:y=3\\ \Rightarrow\left(18+12\right):y=3\\ \Rightarrow30:y=3\\ \Rightarrow y=10\)
câu 11:
\(a,9\times365+2\times365-365=\left(9+2-1\right)\times365=10\times365=3650\\ b,108:9-18:9=\left(108-18\right):9=90:9=10\\ c,43\times95+4\times43+43=43\times\left(95+4+1\right)=43\times100=4300\)
a ) x = 19 20 x = 19 20 b ) x = 83 12 x = − 37 12
c ) x = 31 12 x = − 25 12 d ) x = 13 4 x = − 7 12
y x (53 - 43) = 20220
y x 10 = 20220
y = 20220 : 10
y = 2022