Tính nhanh
58.42+32.8+5.16
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\(58\cdot42+32\cdot8+5\cdot16\)
\(=58\cdot42+16\cdot\left(16+5\right)\)
\(=58\cdot42+16\cdot21\)
\(=42\left(58+8\right)\)
\(=42\cdot64=2688\)
64x25+23x25+25=25(64+23+1)=25x88=2200
b,58x42+32x8+5x16=58x42+16x16+5x16
=58x42+16(16+5)=58x42+16x21=58x42+8x42=42(58+8)=42x56=2352.
58.42+32.8+5.16=58.42+32.8+5.8.2=58.42+32.8+10.8=58.42+(32+10).8=58.42+42.8=(58+8).42=66.42=2772
58.42 + 32.8 + 5.16 = 91.22 + 5.16
= 96.38
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58×42+32×8+5×16=91×22+5×16=96×38=3648
B công thức SC ×thương +dư
a) \(64\cdot25+35\cdot25+25=25\cdot\left(64+35+1\right)=2500\)
b) \(92\cdot42+32\cdot8+5\cdot16\)
\(=8\cdot21\cdot23+16\left(16+5\right)\)
\(=8\cdot21\cdot23+16\cdot21\)
\(=8\cdot21\cdot\left(23+2\right)\)
\(=8\cdot21\cdot25\)
\(=2\cdot21\cdot4\cdot25\)
\(=42\cdot100\)
\(=4200\)
c) \(\left(42\cdot43+43\cdot57+43\right)-360:4\)
\(=\left[43\cdot\left(42+57+1\right)\right]-360:4\)
\(=4300-90\)
\(=4210\)
a) (42 x 43 + 43 x 57 + 43) - 360 : 4
= 43 x ( 42 x 57) + 43 - 360 :4
= 43 x 99 + 43 - 90
= 4257 + 43 - 90
= 4300 - 90
= 4210
b) (372 - 194 x 4) + (981 : 9 - 13)
= (372 - 776) + (109 - 13)
= -404 + 96
= -308
c) 456 : 2 x 18 + 456 : 3 - 102
= 228 x 18 + 152 - 102
= 4104 + 152 - 102
= 4256 - 102
= 4154
2772
58.42+32.8+5.16
=58.42+16.16+5.16
=58.42+16.(16+5)
=58.42+16.21
=58.42+8.42
=42.(58+8)
=42.66
=2772