Question

19．直接寫出得數(shù)．

5.5+0.55=	12÷40%=	1.64÷0.164=	7-$\frac{1}{7}$-$\frac{6}{7}$=	1.25×$\frac{2}{3}$×0.8=
10-$\frac{5}{8}$=	25×2.4=	$\frac{3}{4}$×4÷4×$\frac{3}{4}$=	4÷（$\frac{1}{8}$+$\frac{1}{4}$）=	$\frac{3}{4}$-$\frac{1}{5}$=

Answer 1

分析 考查了小數(shù)和分?jǐn)?shù)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．注意7-$\frac{1}{7}$-$\frac{6}{7}$根據(jù)減法的性質(zhì)計(jì)算，1.25×$\frac{2}{3}$×0.8變形為1.25×0.8×$\frac{2}{3}$計(jì)算，25×2.4變形為25×4×0.6計(jì)算，$\frac{3}{4}$×4÷4×$\frac{3}{4}$變形為（$\frac{3}{4}$×$\frac{3}{4}$）×（4÷4）計(jì)算．

解答 解：

5.5+0.55=6.05	12÷40%=30	1.64÷0.164=10	7-$\frac{1}{7}$-$\frac{6}{7}$=6	1.25×$\frac{2}{3}$×0.8=$\frac{2}{3}$
10-$\frac{5}{8}$=9$\frac{3}{8}$	25×2.4=60	$\frac{3}{4}$×4÷4×$\frac{3}{4}$=$\frac{9}{16}$	4÷（$\frac{1}{8}$+$\frac{1}{4}$）=$\frac{32}{3}$	$\frac{3}{4}$-$\frac{1}{5}$=$\frac{11}{20}$

點(diǎn)評 考查了小數(shù)和分?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．