=54×59

=3 186

2、87× 10 1-87

=87×( 10 1- 1)

=87× 100

=8700

3、39×48+52×39

=39×(48+52)

=39× 100

=3900

Formula calculation, how to calculate 20+252/24 as simply as possible.

=20+ 10.5

=30.5

2820-87×30

=2820-26 10

=2 10

(2.3+ 1.8)×6.5

=4. 1×6.5

=26.65

400÷ 1.25 = 400÷ 1.25 x8 =

=400÷ 10x8

=320

Urgent ~! Simple calculation of primary school mathematics (how to calculate simply, you must get rid of me).

1.89/(0.54+24)/0.25

=( 1.89/0.54+ 1.89/24)*4

Two.

7. 14/3.5*3.6

=7. 14* 36

-

35

Three.

17.68/(5.2+2.05)*4.6

Multiply first and then divide.

960 times 46 divided by 24, calculated by disjunction. How to calculate 960×46÷24 simply and conveniently?

=960÷24×46

=40×46

= 1840

Off-test calculation, simple how to calculate. Just a few! 400×0.75%÷5

=400X0.25X0.03÷5

=3÷5

=0.6

4.2÷25%+( 180%+5.7)

=(4÷0.25+0.2÷0.25)+( 1.8+5.7)

= 16.8+7.5

=24.3

36/5÷ 18/25-5/24÷5/ 14

= 10-7/ 12

=9 5/ 12

4×60%+ 19/25×40%+ 19/25×60%

=4X0.6+ 19/25(0.4+0.6)

=2.4+0.76

=3. 16

40 15-3.75× 10%-5/8

=40 15 - 0.375-0.625

=40 15-(0.375+0.625)

=40 15- 1

=40 14

7/3×72%÷2 1/5

=(7/3)X( 18/25)X(5/2 1)

=2/5

Off-formula calculation. (How to calculate it simply) 12.3×3.6 12.3×3.6

= 12.3×(4-0.4)

= 12.3×4- 12.3×0.4

=49.2-4.92

=44.28

Off-model calculation (simple as this). (18.6 parting calculation (as simple as that).

( 18.6- 18.6÷3. 1)× 1.6?

12.5×2.5×3.2?

4.5÷ 18

32.9×0.46+5.4×3.29.

( 1)( 18.6- 18.6÷3. 1)× 1.6,

=( 18.6-6)× 1.6,

= 12.6× 1.6,

=20. 16,

(2) 12.5×2.5×3.2,

=( 12.5×8)×(2.5×0.4),

= 100× 1,

= 100,

(3)4.5÷ 18=0.25,

(4)32.9×0.46+5.4×3.29,

=3.29×(4.6+5.4),

=3.29× 10,

=32.9.

problem analysis

(1) and (3) are calculated in the order of decimal elementary arithmetic.

(2) Decompose 3.2 into 8×0.4, and then use the multiplicative associative law to calculate.

(4) Multiplicative distribution law is used for simple calculation.

Comments by famous teachers

Test sites for this question:

Decimal elementary arithmetic; Regular operation and simple operation.

Test site notes:

According to the characteristics of the formula, the multiplicative associative law and the multiplicative distributive law are used flexibly to simplify this kind of problem.

7.8 plus 9.9=? (disjunctive calculation), as simple as you want =7.8 ten 10-0. 1.

= 17.8-0. 1

= 17.7

Off-formula calculation. (Simple calculation) 3.3 × 9.9; ( 1)3.3×9.9

=3.3×( 10-0. 1)

=3.3× 10-3.3×0. 1

=33-0.33

=32.67;

(2)4.9÷0. 14÷0.5

=4.9÷(0. 14×0.5)

=4.9÷0.07

=70.