tolong jawab nomor yg dibulatin sama caranya please jawab sekarang ya...

6.)-400×16=-6.400
-900÷-30=+30
+1400
=-6.400+30+1400=-4970
7.)3.000
+1.500÷(-50)=-30
-200×(-7)=1400
3.000-30+1400=4.370
8.)800-900
+650×(-8)=-5.200:130=-40
800-900-40=-140
9.)1800:(-45)=-40×35
=1400
-40×45=-180
1400-180=1.220