A. 1 divided by a nonzero number is called the reciprocal of this number.
B The product of two numbers is 1, and these two numbers are reciprocal.
C. the reciprocal of a number must be less than this number.
The quotient of a number and its reciprocal is equal to the square of this number.
Known │x│=4, │y│=5 and x >；; The value of y, 2x-y is ()
A.- 13
B.+ 13
C.-3 or+13
D.+3 or-13
The following statement is true ()
A. if │a│=│b│, then a = B.
B. If │ A │a│& gt；; │b│, and then a>b
C. if a
D. if │a│=│b│, then a = B.
If A and B are reciprocal, C and D are reciprocal, and the absolute value of M is 2, then the value of algebraic expression M 2-CD+A+B/M is ().
A.-3
B.3
C.-5
D.3 or -5
Calculation:-2 4-[(-3) 2-(1-2 3 * 5/4) ÷ (-2)]
Simple calculation:11* 3+1* 5+...+1/99 * 31.Any antonym of rational number is equal to the number itself.
be
no
2. The farther away from the origin on the number axis, the larger the number.
be
no
3.|-3.5|=-(-3.5)
be
no
4.a and B are rational numbers. If | A | = | B |, then a = b.
be
no
3. Calculate the following questions and choose the correct answer: (each question 10)
1.│-2(3/4)│*│-2(2/ 1 1)│
A 3
B 9
C 6
D 12
2. 1/2-{3/4-( 1/4+5- 1/2)}
A 4
B 4.5
C 5.5
D 5
1、 ; How to write "minus 3 to the 6th power". The square of 9 is.
The reciprocal of 2.-0. 125 is _ _ _ _ _ _ _ _ _ _ _ _ _.
The reciprocal of 3 is. The reciprocal of a rational number is equal to the reciprocal of its absolute value.
4. According to the statement formula: (1)-6 plus the product of -3 and 2:; (2) Divide the sum of -2 and 3 by -3:
The difference between the square of -3 and 2:
5. Expressed by scientific notation:109000 =; 89900000≈ (two significant figures are reserved).
6 Rounding to the nearest value: 70.60 has a significant figure of 2.096≈ (accurate to 1%); 15.046≈ (accurate to 0.1); 47560≈ (accurate to thousands); 47560≈ (two significant figures are reserved).
7. Fill in the appropriate numbers in the brackets to make the equation hold:
( ); 8-2 1+23- 10=(23-2 1)+( ); ( )。
8.① There are 580,000 people in our city; There are five people in his family; It's half past nine; ④ Your height is158cm; ; ⑤ There are 20 classes in our school; He weighs 58 kilograms. Where a, 135B, 246C, 16D and 256 () are exact numbers.
9, the following all kinds of calculation results to judge the correct symbol is ()
A, B,
Give it to me! Typing is difficult! Add a few points!