(1)7.9*103-0.9*103= (2)6.79÷20+2.3= (20是常數(shù)) (3)28*3.23÷6.519= (4)503.7*1.2-4.7*100=
(1)6.80x103-20= (2)7.234+20-5.28= (3)172.0347+2.1+70-0.01= (4)5.231x2.0÷10=
(1)76.9÷10+2.3= (2)(5.002-4.002)3.002= (3)(2.480-2.2)x5.989= (4)2.00x4.00+50.0x1.00-20x0.1=