Current location - Training Enrollment Network - Mathematics courses - Five problems in the calculation of rational numbers in junior one mathematics. Seek an answer
Five problems in the calculation of rational numbers in junior one mathematics. Seek an answer
1、(+7.2)-(+3.6)-(-3.6)-(-2.5)

=7.2-3.6+3.6+2.5

=(7.2+2.5)+(-3.6+3.6)

=9.7+0

=9.7

2、(-72)-(-37)-(-22)- 17

=-72+37+22- 17

=(-72+22)+(37- 17)

=-50+20

=-30

3、0-(+3)-|-3.5|-(-4.2)

=0-3-3.5+4.2

=-3-3.5+4.2

=-6.5+4.2

=-2.3

4、 1/2-(- 1/2)-(-3/4)- 1/6

= 1/2+ 1/2+3/4- 1/6

= 1+3/4- 1/6

=7/4- 1/6

=2 1/ 12-2/ 12

= 19/ 12

= 1 and 7/ 12

5、2/3- 1/8-(- 1/3)+(-3/8)

=2/3- 1/8+ 1/3-3/8

=(2/3+ 1/3)-( 1/8+3/8)

= 1- 1/2

= 1/2