有道题不会,求解!!!!!!!!!!!!
1.392.6*192-39260*0.922.3.7*15+21*4.53.0.9999*0.7+0.1111*2.74.(1+0.23+0.34)*(0.23+0.3...
1 . 392.6*192-39260*0.92
2 . 3.7*15+21*4.5
3 . 0.9999*0.7+0.1111*2.7
4 . (1+0.23+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34)
以上题目都要简便计算。 展开
2 . 3.7*15+21*4.5
3 . 0.9999*0.7+0.1111*2.7
4 . (1+0.23+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34)
以上题目都要简便计算。 展开
2个回答
展开全部
1 . 3926*192-39260*0.92
=3926*192-3926*92
=3962*(192-92)
=3962*100
=396200
2 . 3.7*15+21*4.5
=3.7*15+6.3*15
=(3.7+6.3)*15
=10*15
=150
3 . 0.9999*0.7+0.1111*2.7
=0.1111*6.3+0.1111*2.7
=0.1111*(6.3+2.7)
=0.1111*9
=0.9999
4 . (1+0.23+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34)
=(0.23+0.34+0.65)+(0.23+0.34)*(0.23+0.34+0.65)-(0.23+0.45)-(0.23+0.45+0.65)*(0.23+0.45)
=(0.23+0.45+0.65)-(0.23+0.45)
=0.65
=3926*192-3926*92
=3962*(192-92)
=3962*100
=396200
2 . 3.7*15+21*4.5
=3.7*15+6.3*15
=(3.7+6.3)*15
=10*15
=150
3 . 0.9999*0.7+0.1111*2.7
=0.1111*6.3+0.1111*2.7
=0.1111*(6.3+2.7)
=0.1111*9
=0.9999
4 . (1+0.23+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34)
=(0.23+0.34+0.65)+(0.23+0.34)*(0.23+0.34+0.65)-(0.23+0.45)-(0.23+0.45+0.65)*(0.23+0.45)
=(0.23+0.45+0.65)-(0.23+0.45)
=0.65
展开全部
1 . 392.6 × 192 - 39260 × 0.92
= 392.6 × 192 - 392.6 × 100 × 0.92
= 392.6 × 192 - 392.6 × 92
= 392.6 × (192 - 92)
= 392.6 × 100
= 39260
2 . 3.7 × 15 + 21 × 4.5
= 3.7 × 10 × 1.5 + 21 × 3 × 1.5
= 37 × 1.5 + 63 × 1.5
= 1.5 × (37 + 63)
= 1.5 × 100
= 150
3 . 0.9999 × 0.7 + 0.1111 × 2.7
= 0.9999 × 0.7 + 0.1111 × 9 × 0.3
= 0.9999 × 0.7 + 0.9999 × 0.3
= 0.9999 × (0.7 + 0.3)
= 0.9999 × 1
= 0.9999
4 . ( 1 + 0.23 + 0.34 ) × ( 0.23 + 0.34 + 0.65 ) - ( 1 + 0.23 + 0.34 + 0.65 ) × ( 0.23 + 0.34 )
= (0.23 + 0.34 + 0.65)+ (0.23 + 0.34 + 0.65)× (0.23 + 0.34)- [(0.23 + 0.34)+
(0.23 + 0.34 + 0.65)× (0.23 + 0.34)]
= (0.23 + 0.34 + 0.65)+ (0.23 + 0.34 + 0.65)× (0.23 + 0.34)-(0.23 + 0.34 + 0.65)
× (0.23 + 0.34)- (0.23 + 0.34)
= 0.23 + 0.34 + 0.65 - (0.23 + 0.34)
= 0.65
= 392.6 × 192 - 392.6 × 100 × 0.92
= 392.6 × 192 - 392.6 × 92
= 392.6 × (192 - 92)
= 392.6 × 100
= 39260
2 . 3.7 × 15 + 21 × 4.5
= 3.7 × 10 × 1.5 + 21 × 3 × 1.5
= 37 × 1.5 + 63 × 1.5
= 1.5 × (37 + 63)
= 1.5 × 100
= 150
3 . 0.9999 × 0.7 + 0.1111 × 2.7
= 0.9999 × 0.7 + 0.1111 × 9 × 0.3
= 0.9999 × 0.7 + 0.9999 × 0.3
= 0.9999 × (0.7 + 0.3)
= 0.9999 × 1
= 0.9999
4 . ( 1 + 0.23 + 0.34 ) × ( 0.23 + 0.34 + 0.65 ) - ( 1 + 0.23 + 0.34 + 0.65 ) × ( 0.23 + 0.34 )
= (0.23 + 0.34 + 0.65)+ (0.23 + 0.34 + 0.65)× (0.23 + 0.34)- [(0.23 + 0.34)+
(0.23 + 0.34 + 0.65)× (0.23 + 0.34)]
= (0.23 + 0.34 + 0.65)+ (0.23 + 0.34 + 0.65)× (0.23 + 0.34)-(0.23 + 0.34 + 0.65)
× (0.23 + 0.34)- (0.23 + 0.34)
= 0.23 + 0.34 + 0.65 - (0.23 + 0.34)
= 0.65
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