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= 78 . (31 + 24) + 55 . 22
= 78 . 55 + 55 . 22
= 55 . (78 + 22)
= 55 . 100
= 5500
78.31+78.68+78
=78.31+78.68+78.1
=78.(31+68+1)
=78.100
=7800
1024:(22.7+22.25)
=1024:[22.(7+25)]
=1024:128
=8
24-[20-(5-1)2]
=24-[20-42]
=24-[20-16]
=24-4
=20
x3=64
=>x3=43
=>x=4
2x+1=128
2x.21=128
2x=128:2
2x=64
2x=26
=>x=6
600 × x = 78 x 31 + 78 × 24 + 78 × 17 + 22 × 72
600 × x = 78 × (31 + 24 + 17) + 22 × 72
600 × x = 78 × 72 + 22 × 72
600 × x = 72 × (78 + 22)
600 × x = 72 × 100
600 × x = 7200
x = 7200 : 600
x = 12
Vậy x = 12
Sửa đề: 8666
8666*15+170*4333
=4333*(2*15+170)
=200*4333
=866600
A = 44 . 82 -22 + 18 . 44
= 44 . 82 - 4 + 18 . 44
= 44. ( 82 + 18 ) - 4
= 44 . 100 - 4
= 4400 - 4
= 4396
Ta có: \(A=44\cdot82-2^2+18\cdot44\)
\(=44\cdot\left(82+18\right)-4\)
\(=44\cdot100-4\)
\(=4400-4=4396\)
13: \(\left(-15\right)+8+7\)
\(=\left(-15\right)+\left(8+7\right)\)
=-15+15
=0
14: \(\left(-8\right)+2+6\)
\(=\left(-8\right)+\left(2+6\right)\)
=-8+8
=0
15: \(\left(-1\right)+3-2\)
\(=\left(-1-2\right)+3\)
=-3+3
=0
16: \(25-8-7\)
\(=25-\left(8+7\right)\)
=25-15
=10
17: \(8-2-6\)
\(=8-\left(2+6\right)\)
=8-8
=0
18: \(\left(-12\right)-3+15\)
\(=\left(-12-3\right)+15\)
=-15+15
=0
\(12.57+57.15+63.57\\ \Rightarrow57.\left(12+15+63\right).\\ \Rightarrow57.90=5130.\)
\(78\cdot31+78\cdot24+78\cdot17+22\cdot72\)
\(=78\left(31+24+17\right)+22\cdot72\)
\(=78\cdot72+22\cdot72=72\left(78+22\right)=72\cdot100=7200\)