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Calculation problems in the first volume of junior one mathematics (with answers)
1.-36*(4 o'clock 1-9 o'clock 5+65438+7 o'clock 02)

=-9+20-2 1

=- 10

2.(-42 points 1)÷(6 points 1- 14 points 3+3 points 2-7 points)

=(- 1/42×42)÷42*( 1/6-3/ 14+2/3-2/7)

=- 1÷(7-9+28- 12)

=- 1÷ 14

=- 1/ 14

3.999 and 8/9 (-2+8/9)

=( 1000- 1/9)÷(- 18/9+8/9)

=( 1000- 1/9)×(-9/ 10)

=-900+ 1/ 10

=-899 and 65438+9/00

4.(-49)÷(2 1/3) * 3/7 * (-3 1)

=(-49)÷(7/3)×(3/7)×(- 1/3)

=(-49)×(3/7)×(3/7)×(- 1/3)

=3