18 * 23 +3 +45 * 6 +9 * 32 *2 =1263
425 *7*4 - 170 *60=1700
132 *9 +132 =1320
( 56* 27 +56 +35 ):62=\(\frac{1603}{62}\)
39 * ( 250 +87) +61 * ( 240 +97)=33700
Hk tốt!!! k cho mình nha!!@@
a) \(18\times23+3+45\times6+9\times32\times2\)
\(=18\times23+3+45\times2\times3+18\times32\)
\(=18\times\left(23+32\right)+3\times\left(1+45\times2\right)\)
\(=18\times55+3\times91\)
\(=1263\)
b) \(425\times7\times4-170\times60\)
\(=11900-10200\)
\(=1700\)
c) \(\left(56\times27+56+35\right):62\)
\(=\left[\left(27+1\right)\times56+5\times7\right]:62\)
\(=\left[28\times8\times7+5\times7\right]:62\)
\(=\left[7\times\left(28\times8+5\right)\right]:62\)
\(=\left[7\times229\right]:62\)
\(=1603:62\)
\(=\frac{1603}{62}\)
d) \(39\times\left(250+87\right)+61\times\left(240+97\right)\)
\(=39\times337+61\times337\)
\(=337\times\left(39+61\right)\)
\(=337\times100\)
\(=33700\)
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