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脱式计算及答案(带过程).

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62 X7.1+2.9

=440.2+2.9

=443.1

4.2 X 0.25

=(4+0.2 ) X 0.25

=4 X 0.25+0.2 X 0.25 =1+0.05

=1.05

5.2 X 4.3+0.8 X 4.3 = ( 5.2+0.8 )X 4.3

=6 X 4.3

=25.8

8.5+1.5 - 0.25 X 4 =8.5+6 X 4

=8.5+24

=32.5

0.25 X 0.8+2.5%

=0.2+2.5%

=0.225

32 X 125 X 2.5

=4 X 8X 125 X 2.5

=8 X 125 X( 4X 2.5 ) =1000 X 10

=10000

94 -( 6.84 X-8.5

31.46 - 0.55 )

=0.57+0.1032

=0.6732

945 - 5 - 3

=189 - 3

=63

152 X 3 - 2

=456 - 2

=228

2.5

43 X 12 X 6

=516 X 6

=3096

200+25 X 33

=200+825

=1025

( 25+26 )X 48

=51 X 48

=2448

576- ( 290+107 )

=576-397

=179

=94 - ( 58.14-57.2 )

=94 - 0.94

=100

13 - 0.4 - 2.5

=13 -( 0.4 X 2.5 )

=13 - 1

=13

1.25 X

2.5 X 0.8

= ( 1.25 X 0.8 )X

=1 X 2.5

=2.5

1.5 X 10-1.5

=1.5 X(101-1 )

=1.5 X 100

=150

4.8 X 101

=4.8 X 100+4.8 X 1

=480+4.8

=484.8

3.25 X 4-.7.8

=15.275-7.8

=7.475

0.57+0.43 X 0.24

649+124-556 =773-556

=217

4.82-

5.2 - 0.8 X 0.6 =4.82-

6.5 X 0.6

=4.82-3.9

=0.92

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