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25x27x4简便运算
76.3
X27
-76.3X17的
简便
方法
答:
0.25x9.87x4 =0.
25x4
x9.87 =1x9.87 =9.87 0.73x101 =0.73x(100+1) =0.73x100+0.73 =73+0.73 =73.73 76.3
x27
-76.3x17 =76.3x(27-17) =76.3x10 =763
简便计算
4/1
x27
十4/3
x27
答:
4/1
x27
十4/3
x27
=(4/1十4/3)x27 =1x27 =27
五年级下册数学:设3!=1x2x3,4!=1x2x3
x4
,5!=1x2x3x4x5,那么,36!
答:
35=1x2x3
x4
x5x6x7x8x9x10x11x12x13x14x15x16x17x18x19x20x21x22x23x24x25x26
x27x
28x29x30x31x32x33x34x35
5/9
x27
=,3/10
x4
/9=,1一3/8一5/8=,
答:
图
27x
115-15
x27
18x215
x4
有
简便方法计算
答:
27x
115-15
x27
=
27x
(115-15)=27x100 =2700 18x215
x4
=18x(215x4 )=18x860 =(20-2)x860 =20x860-2x860 =17200-1720 =15480
87乘6+4乘27
简便计算
?
答:
简便计算
87x6+4
x27
=60x6+27x6+
27x4
=360+27x(6+4)=360+27x10 =360+270 =630
36
x27
+18x34 +54
x4
答:
解:36
x27
+18x34 +54
x4
等于( 1800 )∵已知需求出36x27 +18x34 +54x4等于多少 X × Y + X × Z = X × (Y + Z)∴36
x 27
+ 18 x 34 + 54
x 4
= 18 × 2 × 27 + 18 × 34 + 18 × 3 × 4 = 18 × (2 × 27 + 34 + 3 × 4)= 18 × (54 + ...
75
X27
十19X25 31x870十13X310 64X54一32X8怎
简便计算
答:
(1)原式=3×27×
25
+19x25 =81×25+19x25 =(81+19)x25 =100x25 =2500 (2)31x870十13X310 =310x87+13x310 =310x(87+13)=310x100 =31000 (3)64*54-32*8 64*54-64*4 =64*(54-4)=54*50 = 3 200
46.3
x27
.6 463x3 463
x4
.24怎么用
简便计算
?
答:
46.3
x27
.6+463x3+463
x4
.24 =46.3x27.6+46.3x30+46.3x42.4 =46.3x(27.6+30+42.4)=46.3x100 =4630
27的平方-46
x27
+23的平方=?
答:
27的平方-46
x27
+23的平方 =27²-2x23x27+23²=(27-23)²=4²=16
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