a) 90 – ( 30 – 20) = 90 – 10

                   = 80

90 – 30 – 20 = 60 - 20

                  = 40

b) 100 – (60 + 10) = 100 – 70

                   = 30

100 - 60 + 10 = 40 + 10

                   = 50

c) 135 – (30 + 5) = 135 – 35

                   = 100

135 – 30 – 5 = 105 – 5

                   = 100

d) 70 + (40 – 10) = 70 + 30

                   = 100

70 + 40 – 10 = 110 -10

                   = 100

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\(\dfrac{7}{10}=\dfrac{70}{100}>\dfrac{43}{100};\dfrac{6}{10}=\dfrac{60}{100}< \dfrac{85}{100};\dfrac{7}{10}=\dfrac{70}{100}\)

\(\dfrac{7}{10}>\dfrac{43}{100};\dfrac{6}{10}< \dfrac{85}{100};\dfrac{7}{10}=\dfrac{70}{100}\)

=370 nhé bn

100 + 100 : 10 x 20 + 70 = 470

100 x 100 + 200 = 10 200

1111 + 1111 + 1111 + 1111+ 1111 + 1111 + 1111 + 1111 + 1111 + 1111 = 11 110

1111 x 10 = 11 110

Câu 1:100 + 100 :10 x 20 + 70=100+10x20+70=100+200+70=370

Câu 2:100 x 100+200=10 000+200=10 200

Câu 3:1111+1111+1111+1111+1111+1111+1111+1111+1111+1111=1111x10=11 110

Câu 4:1111x10=11 110

100+100:10*20+70=370

100*100+200=10200

1111*10=11110

\(a,100.123-123.100\)

\(=100.\left(123-123\right)\)

\(=100.0\)

\(=0\)

\(b,10.30+70.10\)

\(=10.\left(30+70\right)\)

\(=10.100\)

\(=1000\)

a) 100 x 123 - 123 x 100

= 100 x ( 123 - 123 )

= 100 x 0

=100

b) 10 x 30 + 70 x 10

= 10 x ( 30 + 70)

= 10 x 10

= 100

sorry, dap so cua cau a là 0, mk đánh nhầm số

C

C

C

bài này bằng 270

70 + 90 + 10 +100 = 270 nhá bạn.

       k cho mình nhé.

70+90+10 +100 = 270 

13/10 = 1,3; 70% = 0,7; 41/10= 4,1

1,3 + 0,7  + 4,1 + 0,59 = 6,69

2

Ta có: 

\(\dfrac{13}{10}=1,3;70\%=0,7;\dfrac{41}{10}=4,1\)

\(1,3+0,7+4,1+0,59=6,69\)

Chúc bạn học tốt:>

D.0,9

D.0,9

d 0,9