125×88的简便方法计算 五、用简便方法计算。(要写出简算过程) 1.9+19.9+199.9+0.3 0.25×12.5×3.2 457÷25÷4 6.8-1.36-
五、用简便方法计算。(要写出简算过程) 1.9+19.9+199.9+0.3 0.25×12.5×3.2 457÷25÷4 6.8-1.36-
五、用简便方法计算。(要写出简算过程) 1.9+19.9+199.9+0.3 0.25×12.5×3.2 457÷25÷4 6.8-1.36-
1.9+19.9+199.9+0.3 =2-0.1+20-0.1+200-0.1+0.3=2+20+200-0.3+0.3=222
0.25*12.5*3.2
=0.25*4*12.5*3.2/4=1*12.5*0.8=10
457÷25÷4 =457/(25×4)=457/100=4.57
6.8-1.36-1.64=6.8-3=3.8
1.9+19.9+199.9+0.3用简便计算,怎么简算
把0.3拆成3个0.1,先加到前3个数中去
结果222

用简便方法计算(要写出简算过程) 64.72+0.57-2.72 0.5×2.5×12.5×6
①64.72+0.57-2.72
=64.72-2.72+0.57
=62+0.57
=62.57;
②0.5×2.5×12.5×64
=(0.5×2)×(2.5×4)×(12.5×8)
=1×10×100
=1000;
③
1 64×19+
1 64×13
=
×(19+13)
=
×32
=
.
用简便方法计算,并要写出主要的简算过程.①711+15+411+35②12.5×8×4×0.25.
①
7 11+
1 5+
4 11+
3 5=(
7 11+
4 11)+(
1 5+
3 5)
=1+
=1
4 5;
②12.5×8×4×0.25
=(12.5×8)×(4×0.25)
=100×1
=100.
用简便方法计算(要写出简算过程).3.64+2.7+4.36( 1 4 +, 用简便方法计算(要写出简算过程).3.64+2.7+4.36 ...
(1)3.64+2.7+4.36,=3.64+4.36+2.7,
=8+2.7,
=10.7;(2)( 1 4
+
1 6)×12,
=
×12+
1 6×12,
=3+2,
=5.
脱式计算(能简便计算的要写出简算过程).(1)3.64÷4+4.36×25%(2)3.2×25×12.5(3)34÷[56×(37
(1)3.64÷4+4.36×25%
=3.46×
+4.36×
1 4,
=(3.46+4.36)×
,
=8×
,
=2;
(2)3.2×25×12.5,
=0.8×4×25×12.5,
=(4×25)×(12.5×0.8),
=100×10,
=1000;
(3)
3 4÷[56×(
3 7?
3 8)],
=
÷[56×
3 56],
=
÷3,
=
.
用简便方法计算.(要写出简算过程)①10.8-5.9-4.1 ...
①10.8-5.9-4.1,
=10.8-(5.9+4.1),
=10.8-10,
=0.8;
②
3 4×8+8×
1 4,
=8×(
+
1 4),
=8×1,
=8.
用简便方法计算:(要写出简算过程)(1)29+5.28+79+4.72 ...
(1)
2 9+5.28+
7 9+4.72,
=(
+
7 9)+(5.28+4.72),
=1+10,
=11;
(2)85.7×16+14.3×16,
=(85.7+14.3)×16,
=100×16,
=1600.
1.9+19.9+199.9+0.3怎样简算
2+20+200-0.3+0.3=222