3. A 4. C 三、计算 1.直接写出得数。 24 10 0.5 2/3 0.027 3又3/5 27/8 20 2.计算下面各题,能简算的要简算。 1050÷7-24x4 =150-96 =54 10.5-6.25-3.75+7.5 =(10.5+7.5)-(6.25+3.75) =18-10 =8 3/8x30+2÷8/3 =3/8x30+2x3/8 =3/8x(30+2) =3/8×32 =12 56x(1+4/7)÷8/11 =56×11/8x(1+4/7) =77x(1+4/7) =77x1+77x4/7 =77+44 =121 5/8÷[13/12-(1/12+1/4)] =5/8÷[13/12-1/3] =5/8x4/3 =5/6 (1/8+1/4-1/6)x24 =1/8x24+1/4x24-1/6x24 =3+6-4 =5 (本答案来自普学网 www.puxuewang.com) 3. 解方程。 5/9:x=2/3:36 2/3x=20 x=30 5x+12.9=37.9 5x=25 x=5 |
GMT+8, 2020-12-22 12:11