脱式计算(怎样简便就怎样算) (+)×3.6 3.7×+1.3÷ 4﹣﹣ 2﹣÷﹣ ×+× 16÷(1+)
请你口算。0.38+0.06= (155+20)-65= 64.2+5.7= 543-27-73=0.97-0.09= 12.8-9.86= 17.05-4.58 = 9800÷25÷4=3.5+0.6=4.1 5-0.15= 4.35+5.36= 99×66+66= 0.81+0.09= 0÷78= 50-20÷5= 35×25×4=
计算(730-230)÷10+42 24÷(75-67)×60 450-(37.7+83.25)
计算。309×28= 567÷28= 7200÷40= 578÷28=
估算。83÷9≈ 79×30≈ 178÷6≈ 51×68≈
用竖式计算。(①②小题要验算)①51×26 = ②904÷3=③6.2+3.9= ④ 836÷4=