B1

a) 17 b) 6 c) 112 d)9687

B2

100-x=33

x=100-33

x= 67

Ko bít

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a, 21 + 8 = 29

   6 + 72 = 78

b) 42 + 20 = 62

    80 + 15 = 95

c, 630 + 50 = 680

    10 + 470 = 480

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bị sao d

Có (2 x 7 )x2+(5x2)

=14x2+10

=28+10

=38

Gấp đôi ==> x2

Thêm ==> +(biểu thức)

Ta có phép tính:

2x7x2+5x2

=2x14+5x2

=2x(14+5)

=2x19

=38

1. 50x4=200

36×4=144

43×5=215

89x3=267

2.

36-14=22

36+45=81

97+36=133

96-45=51

36+189=225

50x4=200

36x4=144

43x5=215

89x3=267

bai 2

36-14=22

36+45=81

97+36=133

96-45=51

36+189=225

0

10

nha bn k mk nha bn

thanks nhju

\(99+1-100=0\)

\(66+44-100=10\)

k mk mk k lại nhé

\(a,2\times3=6\)

\(6\times2=12\)

\(10\times2=20\)

\(1\times2=2\)

\(b,5\times7=35\)

\(9\times5=45\)

\(5\times8=40\)

\(1\times5=5\)

a)x+10=30

=>x=20

b)x+10-5=20+20

x+10-5=40

x+10=45

=>x=35

x + 10 = 50 - 20

x + 10 = 30

x = 20 

x + 10 - 5 = 20 + 20

x + 5 = 40

x = 35 

Các kí tự dưới đây thuộc hàng phím nào?q w e r t y u i o p [ ] \a s d f g h j k l : ‘z x c v b n m , . /

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50 - 49 = 1

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