文档介绍：× 4= 0. 07× = 33× = × 4= × = 15× = × = × = 54× = × = × = × 100= × = × = 25× = × = 6× = × = × = × = × = × = × = × 20= × = 3× = × = × = × = 23× = × 100= × 2= × 10= 0× = × 4= × = × = 60× = × = × 8= 4-= 82-= 19+= 4. 1-= 5. 68+= 6. 1-= - = += -= 1-= += 5× 400= += 187 ÷ 1000= 1+= × 10= 75÷ 10= ÷ 8= × 7= × 7= × 8= × 8= × 2=5× = × = × = × 0= 10× = × 7= × 100= × 4= × 4= 4× = 430-250= += -= 7200 ÷ 800= += -= 17× 300= -= += 600 × 0. 7= += += 670+250= += -6= 8500 ÷ 500= -= += 25× 100= -= 2+= 380-290= += += 3500 ÷ 70= +3= += 7500 ÷ 250= +1= -= 450+780= += 3+= 630 ÷ 9= -= -5= 330 × 9= -= -= += 1-= += += +4= 4-= += += += 23× 100= -= 480 ÷ 40= ÷ 100= += 125 × 80= ÷ 10= += 70× 12= × 100= -= -= × 10= 10+= 1-= × 1000= 0 .82+= += × 1