1楼:沙碧兽
(1)3.8-1.9+7.2-8.1,
=(3.8+7.2)-(1.9+8.1),=11-10,
=1;(2)(7 8
+5 8
)÷3 7
÷15,
=3 2
÷3 7
÷15,
=7 2
÷15,
=7 30
;(3)40-(7.7+4.8÷1.2),
=40-(7.7+4),
=40-11.7,
=28.3;
(4)(3
29+1 13
)×13×29,
=3 29
×13×29+1
13×13×29,
=39+29,
=68.
计算下面各题,能简算的要简算1/2+4/7+3/7 1/10+3/8-2/5 1-(2/3+1/8) 7/8-(2/3-1/4) 1/9+(1/6+2/9)+5/6
2楼:新野旁观者
计算下面各题,能简算的要简算
1/2+4/7+3/7
=1/2+(4/7+3/7)
=1/2+1
=1又1/2
1/10+3/8-2/5
=19/40-2/5
=3/40
1-(2/3+1/8)
=1-2/3-1/8
=1/3-1/8
=5/24
7/8-(2/3-1/4)
=7/8+1/4-2/3
=9/8-2/3
=11/24
1/9+(1/6+2/9)+5/6
=(1/9+2/9)+(1/6+5/6)
=1/3+1
=1又1/3
,能简算的要简算1/2+4/7+3/7 1/10+3/8-2/5 1-(2/3+1/8) 7/8-(2/3-1/4) 1/9+(1/6+2/9)+5/6
3楼:新野旁观者
计算下面各题,能简算的要简算内
1/2+4/7+3/7
=1/2+(4/7+3/7)
=1/2+1
=1又容1/2
1/10+3/8-2/5
=19/40-2/5
=3/40
1-(2/3+1/8)
=1-2/3-1/8
=1/3-1/8
=5/24
7/8-(2/3-1/4)
=7/8+1/4-2/3
=9/8-2/3
=11/24
1/9+(1/6+2/9)+5/6
=(1/9+2/9)+(1/6+5/6)
=1/3+1
=1又1/3
计算下面各题(能简算的要简算)48-2.3×1250×(0.8+0.4)7.34×2.1+7.34×7.8+7.34×1.120.5÷1.25÷0.
4楼:淹了学校
①48-2.3×12,
=48-27.6,
=20.4;
②50×(0.8+0.4),
=50×0.8+50×0.4,
=40+20,
=60;
③7.34×2.1+7.34×7.8+7.34×1.1,=7.34×(2.1+7.8+1.1),
=7.34×10,
=73.4;
④20.5÷1.25÷0.8,
=20.5÷(1.25×0.8),
=20.5÷1,
=20.5;
⑤(8.1-5.4)÷3.6+85.7,
=2.7÷3.6+85.7,
=0.75+85.7,
=86.45;
⑥9.88×9+9.88,
=9.88×(9+1),
=9.88×10,
=98.8.
计算下面各题,能简算的要简算,并写出主要的计算过程.①7.8-8.75+2.2-1.25②13.2÷(9.4-5)+5.32③1-
5楼:可乐
①7.8-8.75+2.2-1.25,
=(7.8+2.2)-(8.75+1.25),=10-10,
=0;②13.2÷(62616964757a686964616fe78988e69d83313333353331389.4-5)+5.32,
=13.2÷4.4+5.32,
=3+5.32,
=8.32;
③1-3 7
-4 7
,=1-(3 7
+4 7
),=1-1,
=0;④13
17-(5
17+1
10),
=13 17
-517
-1 10
,=8 17
-110
,=63
170;
⑤1 5
+(5 6
-1318
),=1 5
+(15
18-13
18) ,
=1 5
+1 9
,=1445.
脱式计算:能简算的要简算。,脱式计算:一、能简算的要简算。③4/7×5/9+3/7×5/9 = = = =
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