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\(\left(-216\right):9+7^5:7^3-\left(-4\right)^2.5\)
\(\Leftrightarrow\left(-24\right)+7^2-16\)
\(\Leftrightarrow\left(-24\right)+49-16\)
\(\Leftrightarrow25-16\)
\(\Leftrightarrow9\)
\(3.\left(-5\right)^2+2.\left(-15\right)-20=3.25-2.15-20=75-30-20=25\)
bai 1
20:(24-(3^2.4-34)^2)-20
=20:(24-(9.4-34)^2)-20
=20:(24-2^2)-20
=20:20-20
=-19
bai 2
a
14+5x=4^6:4^3
14+5x=4^3
14+5x=64
5x=64-14
5x=50
x=50:5
x=10
b
189-2.(93-x)=59
2..(93-x)=189-59
2.(93-x)=130
(93-x)=130:2
93-x=65
x=93-65
x=28
1) \(20:\left[24-\left(3^2.4-34\right)^2\right]-20\)
\(=20:\left[24-\left(9.4-34\right)^2\right]-20\)
\(=20:\left[24-4\right]-20\)
\(=20:20-20\)
\(=1-20\)
\(=-19\)
2)a.\(14+5x=4^6:4^3\)
\(14+5x=64\)
\(5x=64-14\)
\(5x=50\)
\(\Rightarrow x=10\)
b) 189-2(93-x)=59
2(93-x) =189-59
2(93-x) =130
93-x =130:2
93-x =65
x =93-65
x =28
Học tốt nha!!!
-17.25=-425
2.
5(-8).2(-3)=10.24=240
3(-5)2+2(-5)-20=15.5+(-2)5-4.5=(15-2-4).5=9.5=45
34.(15-10)-15(34-10)=34.15-34.10-15.34+15.10=0+(-34+15).10=-19.10=-190
\(3.\left(-5\right)^2+2.\left(-15\right)-20=-15.\left(-5\right)+2.\left(-5\right).3+4.\left(-5\right)\)
\(=-5.\left(-15+2.3+4\right)\)
\(=-5.\left(-5\right)\)
\(=25\)