脱式计算简算题四年级 脱式计算,能简算的要简算.3.5×4.5×4; 12.6-1.9+1.9-3
脱式计算,能简算的要简算.3.5×4.5×4; 12.6-1.9+1.9-3
脱式计算,能简算的要简算.3.5×4.5×4; 12.6-1.9+1.9-3
(1)3.5×4.5×4=3.5×(4.5×4)
=3.5×18
=63;(2)12.6-1.9+1.9-3.39
=12.6-3.39+(1.9-1.9)
=9.21+0
=9.21;
(3)1÷[0.1÷(1.43-0.93)]
=1÷(0.1÷0.5)
=1÷0.2
=5;
(4)4.4×4.6+5.4×4.4
=(4.6+5.4)×4.4
=10×4.4
=44.
脱式计算(能简算的要简算):①8.7-3.8×3.5÷1.9②218×9.25+598×3
①8.7-3.8×3.5÷1.9,
=8.7-3.8÷1.9×3.5,
=8.7-2×3.5,
=8.7-7,
=1.7;
②
21 8×9.25+
59 8×
37 4,
=
×9.25+
59 8×9.25,
=(
+
59 8)×9.25,
=10×9.25,
=92.5;
③3×(
2 15+
1 12)-
2 5,
=3×
+3×

1 12
-
2 5,
=
+
1 4-
2 5,
=
;
④
1 2+
1 6+
1 12+
1 20+
1 30+
1 42+
1 56+
1 72+
1 90,
=1-
+
1 2?
1 3+
1 3-
1 4+…+
1 9-
1 10,
=1-
脱式计算,能简算的要简算9-1.9×(4.7-4.5) 8.65-3.7+
(1)9-1.9×(4.7-4.5),
=9-1.9×0.2,
=9-0.38,
=8.62;
(2)8.65-3.7+1.35-6.3,
=(8.65+1.35)-(3.7+6.3),
=10-10,
=0;
(3)1.2+36÷[20×(0.1-0.05)],
=1.2+36÷[20×0.05],
=1.2+36÷1,
=37.2;
(4)(16.5×3+3×7.5)÷6,
=(16.5+7.5)×3÷6,
=24×3÷6,
=12.
脱式计算.(能简算的要简算)2.5×(1.9+1.9+1.9+1.9)19×99+992.5×13×0.4 1 12 ÷(
(1)2.5×(1.9+1.9+1.9+1.9),
=2.5×(1.9×4),
=2.5×4×1.9,
=10×1.9,
=19;
(2)19×99+99,
=(19+1)×99,
=20×99,
=1980;
(3)2.5×13×0.4,
=(2.5×0.4)×13,
=1×13,
=13;
(4)
÷(
1 4+
1 6),
=
÷(
3 12+
2 12),
=
÷
5 12,
=
×
12 5,
=
.
脱式计算:(能简算的要简算)12.8+1.9+15.94;7.69+(4.76-1.9
(1)12.8+1.9+15.94,=14.7+15.94,
=30.64;(2)7.69+(4.76-1.96),
=7.69+2.8,
=10.49;
(3)4.68+2.72+7.32,
=(4.68+7.32)+2.72,
=12+2.72,
=14.72;
(4)25.06-2.65-8.35,
=25.06-(2.65+8.35),
=25.06-11,
=14.06.
计算,能简算的要简算:2.38×1.9+7.62×1.9 &...
(1)2.38×1.9+7.62×1.9
=1.9×(2.38+7.62)
=1.9×10
=19
(2)5.7×5-8.52
=28.5-8.52
=19.98
(3)0.96×101
=0.96×(100+1)
=0.96×100+0.96×1
=96+0.96
=96.96
脱式计算,能简算的要简算: 46.5×99+46.5 12.5÷2.5÷0.4 2.6×1.9÷2.6×1.9 (7.7+
(1)46.5×99+46.5
=46.5×(99+1)
=46.5×100
=4650
(2)12.5÷2.5÷0.4
=12.5÷(2.5×0.4)
=12.5÷1
=12.5
(3)2.6×1.9÷2.6×1.9
=2.6÷2.6×1.9×1.9
=1×1.9×1.9
=3.61
(4)(7.7+1.54)÷0.7
=9.24÷0.7
=13.2
(5)10.8÷[(4.62-1.92)×4]
=10.8÷[2.7×4]
=10.8÷10.8
=1
(6)2.6×(2.139÷9.3×6.2)
=2.6×(0.23×6.2)
=2.6×1.426
=3.7076
脱式计算(能简算的要简算) 3.4÷[(1.2+0.5)×5] 1.9+19.9
(1)3.4÷[(1.2+0.5)×5],=3.4÷[1.2×5+0.5×5],
=3.4÷[6+2.5],
=3.4÷8.5,
=0.4;
(2)1.9+19.9+199.9+0.3,
=1.9+19.9+199.9+(0.1+0.1+0.1),
=(1.9+0.1)+(19.9+0.1)+(199.9+0.1),
=2+20+200,
=222.