脫式計(jì)算
4.8+4.2÷60              
279+141+121           25×23×4
102×88-2×88           (40+4)×25          13.75-5.28-4.72.
分析:(1)先算除法,再算加法;
(2)運(yùn)用加法交換律簡(jiǎn)算;
(3)運(yùn)用乘法交換律簡(jiǎn)算;
(4)(5)運(yùn)用乘法分配律簡(jiǎn)算;
(6)運(yùn)用減法的性質(zhì)簡(jiǎn)算.
解答:解:(1)4.8+4.2÷60,
=4.8+0.07,
=4.87;

(2)279+141+121,
=(279+121)+141,
=300+141,
=441;

(3)25×23×4,
=(25×4)×23,
=100×23,
=2300;

(4)102×88-2×88,
=(102-2)×88,
=100×88,
=8800;

(5)(40+4)×25,
=40×25+4×25,
=1000+100,
=1100;

(6)13.75-5.28-4.72,
=13.75-(5.28+4.72),
=13.75-10,
=3.75.
點(diǎn)評(píng):完成本題,要注意分析式中數(shù)據(jù),運(yùn)用合適的簡(jiǎn)便方法計(jì)算.
練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目:小學(xué)數(shù)學(xué) 來源: 題型:

脫式計(jì)算(能簡(jiǎn)算的要簡(jiǎn)算)
12.65-(3.65+8.5)
7.8+9+7.8 4.82-0.25+1.25+0.25
9.99-4.8 1.36+6.7+4.3 1.36-1.36+25.2.

查看答案和解析>>

科目:小學(xué)數(shù)學(xué) 來源: 題型:

脫式計(jì)算.(能簡(jiǎn)算的要簡(jiǎn)算)
(0.45×6.38+0.45×3.62)÷0.5;  
59.3×3+38×59.3+59.3×19;
8-4.68÷4.5×(0.25+0.5);
3.6×[(53.73-17.49)÷(0.36÷0.9)].

查看答案和解析>>

科目:小學(xué)數(shù)學(xué) 來源: 題型:

脫式計(jì)算,能簡(jiǎn)算的用簡(jiǎn)算.
5.5×17.3+6.7×5.5                 
1.5×105                      9.07-22.78÷3.4
3.8+4.29+2.1+4.2               2.65×1.7+1.35×1.7                23.4÷7.8-2.1
0.75×18÷0.15              2.5×3.2×1.25                    0.26×2.5+0.74×2.5+2.5
18.09-7.5×(0.14+1.06) 9÷[(38.02+1.98)×0.5            26×20.2-8.4-1.8
90-78.09+4.23         32.34÷2.l×0.45              15.32-1.8×5-3.46
(9-2.78)×15÷3.11         (1.36+4.85)÷(0.15×6) 3.6÷〔(1.3+0.6)×5〕
0.01+1.01×99              89.3×43+38×89.3+893×1.9          10.01×101-10.01
38×7.3+27×3.8                   32×1.25×0.25              38.75-(24.5+8.75)

查看答案和解析>>

科目:小學(xué)數(shù)學(xué) 來源: 題型:

脫式計(jì)算,能簡(jiǎn)算的要簡(jiǎn)算
817+278÷4 45×9.8 5.4×2.8-7.63
4.5+(2-0.75)×6 1.25×2.5×0.8×4 2.3+3.91÷(22-19.7)

查看答案和解析>>

同步練習(xí)冊(cè)答案