Question

1．直接寫出得數(shù)．

1.25×0.8=	100×0.1%=	9.9÷1.1=	1200÷25=
0.9×99+0.9=	15.4-0×6.58=	$\frac{5}{9}$×$\frac{9}{20}$+$\frac{3}{4}$=	$\frac{3}{5}$×$\frac{3}{5}$÷$\frac{3}{5}$=
24×（1+$\frac{1}{6}$+$\frac{1}{3}$）=	7$\frac{3}{5}$-2$\frac{7}{10}$-3.3=

Answer 1

分析 根據(jù)小數(shù)、分?jǐn)?shù)加減乘除法運(yùn)算的計(jì)算法則計(jì)算即可求解．注意1200÷25變形為（1200×4）÷（25×4）計(jì)算，0.9×99+0.9，24×（1+$\frac{1}{6}$+$\frac{1}{3}$）根據(jù)乘法分配律計(jì)算，$\frac{3}{5}$×$\frac{3}{5}$÷$\frac{3}{5}$變形為$\frac{3}{5}$×（$\frac{3}{5}$÷$\frac{3}{5}$）計(jì)算，7$\frac{3}{5}$-2$\frac{7}{10}$-3.3根據(jù)減法的性質(zhì)計(jì)算．

解答 解：

1.25×0.8=1	100×0.1%=0.1	9.9÷1.1=9	1200÷25=4800
0.9×99+0.9=90	15.4-0×6.58=15.4	$\frac{5}{9}$×$\frac{9}{20}$+$\frac{3}{4}$=1	$\frac{3}{5}$×$\frac{3}{5}$÷$\frac{3}{5}$=$\frac{3}{5}$
24×（1+$\frac{1}{6}$+$\frac{1}{3}$）=36	7$\frac{3}{5}$-2$\frac{7}{10}$-3.3=1$\frac{3}{5}$

點(diǎn)評(píng) 考查了小數(shù)、分?jǐn)?shù)加減乘除法運(yùn)算，關(guān)鍵是熟練掌握計(jì)算法則正確進(jìn)行計(jì)算．