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58×42+32×8+5×16=91×22+5×16=96×38=3648
B công thức SC ×thương +dư
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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.
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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
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\(58.42+32.8+5.16\)
\(=58.42+32.8+5.2.8\)
\(=58.42+32.8+10.8\)
\(=58.42+(32+10).8\)
\(=58.42+42.8\)
\(=42(58+8)\)
\(=42.66=2772\)
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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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Sửa đề: 8666
8666*15+170*4333
=4333*(2*15+170)
=200*4333
=866600
\(58.42+32.58+74.42\)
\(=58\left(32+42\right)+74.42\)
\(=58.74+74.42\)
\(=74\left(58+42\right)\)
\(=74.100\)
\(=7400\)
58 x 42 + 32 x 58 + 74 x 42
= 58 x 42 + 58 x 32 + 74 x 42
= 58 x ( 42 + 32 ) + 74 x 42
= 58 x 74 + 74 x 42
= 58 x 74 + 42 x 74
= ( 58 + 42 ) x 74
= 100 x 74
= 7400