1. 直接写出得数。
$\frac{9}{10}-\frac{6}{10}=$ $\frac{6}{11}+\frac{3}{11}=$ $\frac{1}{2}-\frac{1}{2}=$ $\frac{9}{25}+\frac{8}{25}-\frac{7}{25}=$
$\frac{1}{4}+\frac{2}{4}=$ $\frac{4}{6}+\frac{2}{6}=$ $\frac{4}{11}+\frac{7}{11}=$ $\frac{1}{9}+\frac{4}{9}+\frac{2}{9}=$
$\frac{8}{15}+\frac{2}{15}=$ $\frac{2}{7}+\frac{5}{7}=$ $\frac{5}{8}-\frac{4}{8}=$ $\frac{9}{12}-\frac{7}{12}-\frac{1}{12}=$
$1.23÷3=$ $0.16÷8=$ $3.5÷70=$ $1.25×0.73×8=$
$5.1+3.9=$ $4.2×0.3=$ $2.8÷0.14=$ $4.32-1.98-0.02=$
$4.9÷0.07=$ $2.3×100=$ $4.2-0.35=$ $0.25×5.9×4=$
$1-0.01=$ $4.9+1.8=$ $2.7×0.5=$ $0.3×10÷0.1=$
$\frac{9}{10}-\frac{6}{10}=$ $\frac{6}{11}+\frac{3}{11}=$ $\frac{1}{2}-\frac{1}{2}=$ $\frac{9}{25}+\frac{8}{25}-\frac{7}{25}=$
$\frac{1}{4}+\frac{2}{4}=$ $\frac{4}{6}+\frac{2}{6}=$ $\frac{4}{11}+\frac{7}{11}=$ $\frac{1}{9}+\frac{4}{9}+\frac{2}{9}=$
$\frac{8}{15}+\frac{2}{15}=$ $\frac{2}{7}+\frac{5}{7}=$ $\frac{5}{8}-\frac{4}{8}=$ $\frac{9}{12}-\frac{7}{12}-\frac{1}{12}=$
$1.23÷3=$ $0.16÷8=$ $3.5÷70=$ $1.25×0.73×8=$
$5.1+3.9=$ $4.2×0.3=$ $2.8÷0.14=$ $4.32-1.98-0.02=$
$4.9÷0.07=$ $2.3×100=$ $4.2-0.35=$ $0.25×5.9×4=$
$1-0.01=$ $4.9+1.8=$ $2.7×0.5=$ $0.3×10÷0.1=$
答案
1. $\dfrac{3}{10}$ $\dfrac{9}{11}$ $0$ $\dfrac{10}{25}$ $\dfrac{3}{4}$ $1$ $1$ $\dfrac{7}{9}$ $\dfrac{10}{15}$ $1$ $\dfrac{1}{8}$ $\dfrac{1}{12}$ $0.41$ $0.02$ $0.05$ $7.3$ $9$ $1.26$ $20$ $2.32$ $70$ $230$ $3.85$ $5.9$ $0.99$ $6.7$ $1.35$ $30$
2. 解方程。
$2x×0.25=8$ $(3.8-2)x=14.4$ $2.16×2+4x=20.12$
$5x-6.4=19.8$ $12.2x+3.6x=37.92$ $46×2.5-25x=45$
$2x×0.25=8$ $(3.8-2)x=14.4$ $2.16×2+4x=20.12$
$5x-6.4=19.8$ $12.2x+3.6x=37.92$ $46×2.5-25x=45$
答案
2. $x=16$ $x=8$ $x=3.95$ $x=5.24$ $x=2.4$ $x=2.8$
如图,两个平行四边形部分重叠,重叠部分的面积是$A$的$\frac{1}{4}$,是$B$的$\frac{1}{6}$,$A$的面积是24平方厘米,$B$的面积是多少?
答案
思维提升
$24÷4=6$(平方厘米)
$6×6=36$(平方厘米)
$24÷4=6$(平方厘米)
$6×6=36$(平方厘米)
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