\(32\times25+18\times100-50\times12\)

\(=800+1800-600\)

\(=2000\)

\(56\times45+28\times98+56\times6\)

\(=2520+2744+336\)

\(=5600\)

32 x 25 + 18 x 100 - 50 x 12 = 32 x 25 + 18 x 4 x 25 - 25 x 2 x 12

                                              = 32 x 25 + 72 x 25 - 25 x 24

                                              = ( 32 + 72 - 24 ) x 25

                                              = 80 x 25

                                              = 2000

56 x 45 + 28 x 98 + 56 x 6 = 56 x 45 + 28 x 2 x 49 + 56 x 6

                                          = 56 x 45 + 56 x 49 + 56 x 6

                                          = 56 x ( 45 + 49 + 6 )

                                          = 56 x 100

                                          = 5600

a: \(8x\left(2023+x\right)-8x\left(x+2024\right)=56\)

=>\(8x\left(x+2023-x-2024\right)=56\)

=>-8x=56

=>\(x=\frac{56}{-8}=-7\) (nhận)

b: \(5-2025x=9-2026\left(x-1\right)\)

=>-2025x+5=9-2026x+2026

=>-2025x+5=-2026x+2035

=>x=2035-5=2030(nhận)

c: \(\left(-12\right)^2\cdot x=56+10\cdot13x\)

=>144x=56+130x

=>14x=56

=>x=4(nhận)

d: -(x-32+11)=(21-33-x+7)

=>-(x-21)=(-x-5)

=>-x+21=-x-5

=>21=-5(vô lý)

=>x∈∅

e: \(-2\left(x+6\right)+6\left(x+10\right)=8\)

=>-2x-12+6x+60=8

=>4x+52=8

=>4x=8-52=-44

=>\(x=-\frac{44}{4}=-11\) (nhận)

x+12=23

x      =23-12

x     =11

34-x=32

     x=34-32

     x=2

x-56=45

x    =45+56

x    =101

x=35

x=2

x=101

\(2^x.2^1=32:2=16\)

\(2^x.2^1=2^4\)

\(2^x=2^{4-1}=2^3\Rightarrow x=3\)

\(7^x.7^{12}=56-7=49\)

\(7^x.7^{12}=7^2\)

\(7^x=7^{2-12}=7^{-10}\Rightarrow x=-10\)

\(3^x.3^1=162:6=27\)

\(3^x.3^1=3^3\)

\(3^x=3^{3-1}=3^2\Rightarrow x=2\)

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Đ/S : 399,1153846

a;(18 - 9 x 2)x (2+ 4 + 6 + 8 + 10)

= (18 - 18)x (2+ 4 + 6+ 8 +10)

= 0 x (2+ 4+ 6+ 8 + 10)

= 0

b; (7 x 8 -56): (2+ 4 + 6 +8 + 112)

= (56 - 56) : (2 +4 +6+ 8+ 112)

= 0 : (2 + 4+ 6 + 8+ 112)

= 0

c; (2 + 125 + 6 + 145 + 112) x (42 - 6 x 7)

= (2+ 125+ 6 + 145+ 112) x (42 - 42)

= (2 + 125+ 6 + 145+ 112) x 0

= 0

Câu d:

(12 x 6 - 12 x 4 - 12 x 2) x (347 + 125)

= 12x(6 - 4 -2) x (347 + 125)

= 12 x (2 - 2) x (347 + 125)

= 12 x 0 x (347 + 125)

= 0 x (347 + 125)

= 0

a) 15 x y - 2009 = 1201

 \(15.x.y=1201+2009\)

\(15.x.y=3210\)

\(x.y=3210:15\)

\(x.y=214\)

Tới đây bó tay

b)[(z + 32) - 15 ] . 2 = 60

\(\left(z+32\right)-15=60:2\)

\(\left(z+32\right)-15=30\)

\(\left(z+32\right)=30+15\)

\(z+32=45\)

\(z=45-32\)

\(z=13\)

c)[161 + (153-z)] .18 = 3870

\(161+\left(153-z\right)=3870:18\)

\(161+\left(153-z\right)=215\)

\(153-z=215-161\)

\(153-z=54\)

\(-z=54-153\)

\(-z=-99\)

\(z=99\)

d)[43 - (56 - z)] . 12 = 384

\(43-\left(56-z\right)=384:12\)

\(43-\left(56-z\right)=32\)

\(-\left(56-z\right)=32-43\)

\(56+z=-11\)

\(z=-11-56\)

\(z=-11-56\)

\(z=-67\)

Mình có thể sai đâu đó

Mong bạn thông cảm

Chúc bạn học giỏi

Câu 1:

\(x\) + 56 x 2 - [32 + 16 x 3 : 6 - 15] = 0

\(x\) + 112 - [32 + 48 : 6 - 15] = 0

\(x\) + 112 - [32 + 8 - 15] = 0

\(x\) + 112 - [40 - 15] = 0

\(x\) + (112 - 25) = 0

\(x\) + 87 = 0

\(x=-87\)

Lớp 5 chưa học số âm, em nhé.

420 + 65 x 4 = (\(x\) + 175) : 5 + 30

420 + 260 = (\(x\) + 175) : 5 + 30

680 = (\(x\) + 175) : 5 = 30

(\(x\) + 175) : 5 = 680 - 30

(\(x\) + 175) : 5 = 650

\(x\) + 175 = 650 x 5

\(x\) + 175 = 3250

\(x\) = 3250 - 175

\(x\) = 3075