知识大全 13.4+5.52+17.6+3.48 .
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计算下面各题,能简算的一定要简算:13.4+5.52+17.6+3.48 ...
(1)13.4+5.52+17.6+3.48
=(13.4+17.6)+(5.52+3.48)
=31+9
=40;
(2)19.38-(3.25+4.38)
=19.38-4.38-3.25
=15-3.25
=11.75;
(3)624÷[52×(10-6)]
=624÷[52×4]
=624÷208
=3;
(4)25×47+75×47
=(25+75)×47
=100×47
=4700.
计算下面各题,能简算的要简算:①18.9×9.9 ...
①18.9×9.9
=18.9×(10-0.1)
=18.9×10-18.9×0.1
=189-1.89
=187.11;
②12.5×8.94×0.8
=12.5×0.8×8.94
=10×8.94
=89.4;
③6.8×32+32×3.2
=32×(6.8+3.2)
=32×10
=320;
④(8.1-5.6)÷0.8+7.75
=2.5÷0.8+7.75
=3.125+7.75
=10.875;
⑤5.6×(12.5-8.5÷0.85)
=5.6×(12.5-10)
=5.6×2.5
=14;
⑥[3.6+(13.3-8.3)×3.6]÷0.36
=[3.6+5×3.6]÷0.36
=[3.6+18]÷0.36
=21.6÷0.36
=60.
计算下面各题(能简算的一定要简算).72×0.26÷6.5 ...
(1)72×0.26÷6.5
=18.72÷6.5
=2.88
(2)0.65×201
=0.65×(200+1)
=0.65×200+0.65
=130+0.65
=130.65
(3)0.5÷1.5÷0.03
=
1 |
3 |
÷
3 |
100 |
=
1 |
3 |
×
100 |
3 |
=
100 |
9 |
(4)1.92÷0.12-2.7
=16-2.7
=13.3
计算下面各题,能简算的要简算.(125+7)×8 ...
(1)(125+7)×8
=125×8+7×8
=1000+56
=1056;
(2)32×38+32×62
=32×(38+62)
=32×100
=3200;
(3)25×44
=25×(4×11)
=25×4×11
=100×11
=1100;
(4)3.27+6.4+2.73+4.6
=(3.27+2.73)+(6.4+4.6)
=6+11
=17;
(5)6.45-0.58-1.42
=6.45-(0.58+1.42)
=6.45-2
=4.45;
(6)12×(324-285)÷26
=12×39÷26
=468÷26
=18.
计算下面各题(能简算的要简算)56-45+310 ...
(1)
5 |
6 |
-
4 |
5 |
+
3 |
10 |
=
1 |
30 |
+
3 |
10 |
=
1 |
3 |
;
(2)
4 |
5 |
-(
3 |
8 |
+
1 |
4 |
)
=
4 |
5 |
-
5 |
8 |
=
7 |
40 |
;
(3)
1 |
2 |
+
4 |
5 |
-
1 |
2 |
+
4 |
5 |
=(
1 |
2 |
-
1 |
2 |
)+(
4 |
5 |
+
4 |
5 |
)
=0+
8 |
5 |
=
8 |
5 |
.
计算下面各题,能简算的要简算.7-15.1+61.3-4.9 ...
(1)7-15.1+61.3-4.9
=(7+61.3)-(15.1+4.9)
=68.3-20
=48.3;
(2)109÷[52+(1-1110)]
=109÷[52+(-1109)]
=109÷(-1057)
=-
109 |
1057 |
;
(3)2710×71×109
=192410×109
=20972690;
(4)24×(41+81-61)
=24×(122-61)
=24×61
=1464.
计算下面各题,能简算的要简算.25×16×125 700÷25 ...
(1)25×16×125
=25×(2×8)×125
=(25×2)×(8×125)
=50×1000
=50000;
(2)700÷25
=(700×4)÷(25×4)
=2800÷100
=28;
(3)18×101-18
=18×(101-1)
=18×100
=1800;
(4)(2030-18×35)÷35
=(2030-630)÷35
=1400÷35
=40;
(5)1600÷[(172-156)×25]
=1600÷[16×25]
=1600÷400
=4.
计算下面各题,能简算的要简算2.4×(3-2.5)÷0.75 ...
(1)2.4×(3-2.5)÷0.75,
=2.4×0.5÷0.75,
=1.2÷0.75,
=1.6;
(2)4.2-1.38+5.8-3.62,
=(4.2+5.8)-(1.38+3.62),
=10-5,
=5;
(3)0.75×99-
3 |
4 |
+2×75%,
=0.75×(99-1+2),
=0.75×100,
=75;
(4)0.125×0.25×32,
=0.125×0.25×4×8,
=(0.125×8)×(0.25×4),
=1×1,
=1.
计算下列各题(能简算的一定要简算) 24×( 14+18-16) 712×0.86+14%÷127 ...
(1)24×(
1 |
4 |
+
1 |
8 |
-
1 |
6 |
),
=24×
1 |
4 |
+24×
1 |
8 |
-24×
1 |
6 |
,
=6+3-4,
=9-4,
=5;
(2)
7 |
12 |
×0.86+14%÷
12 |
7 |
,
=
7 |
12 |
×0.86+0.14×
7 |
12 |
,
=
7 |
12 |
×(0.86+0.14),
=
7 |
12 |
×1,
=
7 |
12 |
;
(3)1?
1 |
2 |
?
1 |
4 |
?
1 |
8 |
?
1 |
16 |
?
1 |
32 |
?
1 |
64 |
,
=
1 |
2 |
?
1 |
4 |
?
1 |
8 |
?
1 |
16 |
?
1 |
32 |
?
1 |
64 |
,
=
1 |
4 |
?
1 |
8 |
?
1 |
16 |
?
1 |
32 |
?
1 |
64 |
,
=
1 |
8 |
?
1 |
16 |
?
1 |
32 |
?
1 |
64 |
,
=
1 |
16 |
?
1 |
32 |
?
1 |
64 |
,
=
1 |
计算下面各题,能简算的要简算:(1)7.5×0.875+75%×1.25 ...
(1)7.5×0.875+75%×1.25
=7.5×0.875+0.75×1.25
=7.5×0.875+7.5×0.125
=7.5×(0.875+0.125)
=7.5×1
=7.5;
(2)
1998+1999×1997 |
1998×1999?1 |
=
1998+1999×(1998?1) |
1998×1999?1 |
=
1998+1999×1998?1999 |
1998×1999?1 |
=
1999×1998?1 |
1998×1999?1 |
=1;
(3)
5 |
6 |
÷[
1 |
6 |
÷(
3 |
4 |
-
2 |
3 |
)]
=
5 |
6 |
÷[
1 |
6 |
÷
1 |
12 |
]
=
5 |
6 |
÷2
=
5 |
12 |
;
(4)
14 |
15 |
×[
7 |
8 |
-(
4 |
7 |
-12.5%)]
=
14 |
15 |
×[
7 |
8 |
-(
4 |
7 |
-
1 |
8 |
)]
=
14 |
15 |
×[
7 |
8 |
-
4 |
7 |
+
1 |
8 |
]
=
14 |
15 |
×[
7 |
8 |
+
1 |
8 |
-
4 |
7 |
]
=
14 |
15 |
×[1-
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