1, x2 and 2 x all represent 2x multiplication. ()

The calculation results of 2.0.3×8 and 3×0.8 are equal. ( )

3. Formulas with unknowns are called equations. ( )

4.5.666666 is a cyclic decimal. ( )

This sphere is round from any angle. ( )

Three, repeated comparison, careful choice (65438+ 0 points for each question, ***5 points)

1, 6.8×101= 6.8×100+6.8 () are used.

A, multiplicative commutative law b, multiplicative associative law c, multiplicative distributive law d, additive associative law

2. When a number y is divided by a pure decimal, the quotient must be () y. ..

A, greater than B, less than C, equal to D, uncertain.

3. 13.6÷2.6 When the quotient is 5, the remainder is ().

a、6 B、0.6 C、0.06 D、0.006

4. If a×1.1= b ÷1.1(A and B ≠0), then

A, A = B, A-B C, A-B D, uncertain

There are m students in grade five, three fewer in grade six than in grade five, and there are () students in class two.

a、m+3 B、m-3 C、2m+3 D、2m-3