1.直接写出得数。(4分)
3.05 - 0.98 =
1.5 × 8 =
2 ÷ $\frac{2}{3}$ =
$\frac{1}{6} ÷ \frac{5}{18}$ =
$\frac{2}{3} × \frac{3}{8}$ =
$\frac{5}{6} - \frac{3}{8}$ =
$\frac{3}{5} ÷ 0.3$ =
$\frac{2}{3} × 0.18$ =
3.05 - 0.98 =
1.5 × 8 =
2 ÷ $\frac{2}{3}$ =
$\frac{1}{6} ÷ \frac{5}{18}$ =
$\frac{2}{3} × \frac{3}{8}$ =
$\frac{5}{6} - \frac{3}{8}$ =
$\frac{3}{5} ÷ 0.3$ =
$\frac{2}{3} × 0.18$ =
答案
1.2.07 12 3 $\frac{3}{5}$ $\frac{1}{4}$ $\frac{11}{24}$ 2 0.12
2. 怎样简便就怎样算。(18分)
$6.25÷0.25$
$6.8+9.2×1.25$
$36×(\dfrac{5}{6}-\dfrac{5}{9}+\dfrac{4}{9})$
$3.14×\dfrac{3}{4}×10+2.5×3.14$
$5-\dfrac{5}{13}×(1\dfrac{3}{10}+2.6)$
$(4-\dfrac{5}{12}÷\dfrac{1}{6})÷0.1$
$2025×\dfrac{3}{25}+2025÷25×22$
$6.25÷0.25$
$6.8+9.2×1.25$
$36×(\dfrac{5}{6}-\dfrac{5}{9}+\dfrac{4}{9})$
$3.14×\dfrac{3}{4}×10+2.5×3.14$
$5-\dfrac{5}{13}×(1\dfrac{3}{10}+2.6)$
$(4-\dfrac{5}{12}÷\dfrac{1}{6})÷0.1$
$2025×\dfrac{3}{25}+2025÷25×22$
答案
2.原式$=(6.25×4)÷(0.25×4)=25÷1=25$
原式$=6.8+(10-0.8)×1.25=6.8+10×1.25-0.8×1.25=6.8+12.5-1=18.3$
原式$=36×\frac{5}{6}-36×\frac{5}{9}+36×\frac{4}{9}=30-20+16=26$
原式$=3.14×7.5+2.5×3.14=3.14×(7.5+2.5)=3.14×10=31.4$
原式$=5-\frac{5}{13}×3.9=5-1.5=3.5$
原式$=(4-2.5)÷0.1=1.5÷0.1=15$
原式$=2025×\frac{3}{25}+2025×\frac{22}{25}=2025×(\frac{3}{25}+\frac{22}{25})=2025$
原式$=6.8+(10-0.8)×1.25=6.8+10×1.25-0.8×1.25=6.8+12.5-1=18.3$
原式$=36×\frac{5}{6}-36×\frac{5}{9}+36×\frac{4}{9}=30-20+16=26$
原式$=3.14×7.5+2.5×3.14=3.14×(7.5+2.5)=3.14×10=31.4$
原式$=5-\frac{5}{13}×3.9=5-1.5=3.5$
原式$=(4-2.5)÷0.1=1.5÷0.1=15$
原式$=2025×\frac{3}{25}+2025×\frac{22}{25}=2025×(\frac{3}{25}+\frac{22}{25})=2025$
3.解方程或比例。(6分)
$8:x=0.4:\frac{3}{4}$
$\frac{2}{3}(x-2)=48$
$2.5x-18=1.5x$
$8:x=0.4:\frac{3}{4}$
$\frac{2}{3}(x-2)=48$
$2.5x-18=1.5x$
答案
3.$x=15$ $x=74$ $x=18$
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