简算大全 计算(能简算的一定要简算)(1)1+2+3+4+5+6+7+8+7+6+5+4+3+2+1888888×888888(2)113×8+218×13+3113
计算(能简算的一定要简算)(1)1+2+3+4+5+6+7+8+7+6+5+4+3+2+1888888×888888(2)113×8+218×13+3113
计算(能简算的一定要简算)(1)1+2+3+4+5+6+7+8+7+6+5+4+3+2+1888888×888888(2)113×8+218×13+3113
(1)
1+2+3+4+5+6+7+8+7+6+5+4+3+2+1 888888×888888,
=
,
=
,
=
;
(2)1
1 3×8+2
1 8×13+3
1 13×18+4
1 18×23+5
1 23×28+6
1 28×33,
=(1+2+3+4+5+6)+(
-
1 8+
1 8-
1 13+
1 13-
1 18+
1 18-
1 23+
1 23-
1 28+
1 28-
1 33)×
1 5,
=21+(
-
1 33)×
1 5,
=21+
×
1 5,
=21+
,
=21
.
计算(能简算的一定要简算)113×8+218×13+3113×18+4118×23+5123×28+6128×33
1
1 3×8+2
1 8×13+3
1 13×18+4
1 18×23+5
1 23×28+6
1 28×33,
=(1+2+3+4+5+6)+
×(
1 3-
1 8+
1 8-
1 13+
1 13-
1 18…
1 28-
1 33),
=21+
×(
1 3-
1 33),
=21+
,
=21
.
88888X88888÷(1+2+3+4+5+6+7+8+7+6+5+4+3+2+1) 简算! 一定要简算
88888X88888÷(1+2+3+4+5+6+7+8+7+6+5+4+3+2+1)
=88888X88888÷64
=11111×11111
=123454321
计算(能简算的一定要简算) 1 2 + 2 2×3 + 3 2×3×4 +…+ 7, 计算(能简算的一定要简算)12+22×3+32×3×4+…+72×3×4×5×6×7×8
1 2 + 2 2×3+
3 2×3×4+…+
7 2×3×4×5×6×7×8,
=
+
3-1 2×3+
4-1 2×3×4+…+
8-1 2×3×4×5×6×7×8,
=
-
1 2+
3 2×3-
1 2×3+
4 2×3×4-
1 2×3×4+…+
8 2×3×4×5×6×7×8-
1 2×3×4×5×6×7×8,
=1-
+
1 2-
1 6+
1 6-
1 24+
1 24-…-
1 2×3×4×5×6×7×8,
=1-
,
=1-
,
=
.
计算,能简算的一定要简算.65.5+65.5×99 5 8 ×[1÷( 3 4 + 1 3 )]
①65.5+65.5×99,=65.5×100,
=6550;② 5 8
×[1÷(
3 4+
1 3)],
=
×[1÷(
9 12+
4 12)],
=
×[1÷
13 12],
=
×
12 13,
=
;
③
2 5÷
3 4÷
1 15,
=
×
4 3×15,
=8;
④3.68-0.82-0.18,
=3.68-(0.82+0.18),
=3.68-1,
=2.68;
⑤36×(
2 9+
7 12),
=36×
+36×
7 12,
=8+21,
=29;
⑥2÷
2 3-
2 3÷2,
=2×
-
2 3×
1 2,
=3-
,
=2
.
脱式计算,能够简算的一定要简算. 3 8 ÷ [( 1 5 + 1 4 )×
① 3 8 ÷ [( 1 5+
1 4)×
3 8],
=
÷
3 8÷(
1 5+
1 4),
=1÷
,
=1×
,
=2
;
②4-
4 5÷4-
4 5,
=4-
×
1 4-
4 5,
=4-(
+
4 5),
=4-1,
=3;
③9
1 4+9.8+9.25×
1 5,
=9.25×(9.8+0.2),
=9.25×10,
=92.5;
④25×(4×11)×7,
=(25×4)×(11×7),
=100×77,
=7700;
⑤(
1 12+
3 5)÷
1 60,
=(
+
3 5)×60,
=60×
+

3 5
×60,
=5+36,
=41;
⑥101×120-83-37,
=101×120-(83+37),
=120×(101-1),
=120×100,
=12000.
计算(能简算的要简算)( 5 6 - 3 7 )×42 4 25 ÷[( 2 5
(1)( 5 6 - 3 7)×42,
=
×42-
3 7×42,
=35-18,
=17;
(2)
4 25÷[(
2 5+
1 3)×
9 11],
=
÷[
11 15×
9 11],
=
÷
3 5,
=
;
(3)(
2 29+
3 23)×29×23,
=(
+
3 23)×(29×23),
=
×(29×23)+
3 23×(29×23),
=
×29×23+
3 23×23×29,
=2×23+3×29,
=46+87,
=133;
(4)
5 6÷[
1 6÷(
3 4-
2 3)],
=
÷[
1 6÷
1 12],
=
÷2,
=
.
脱式计算,能简算的要简算.① 2 3 +( 5 6 - 3 4 )÷ 3 8
① 2 3 +( 5 6-
3 4)÷
3 8,
=
+
1 12÷
3 8,
=
+
2 9,
=
;
②32×40+450÷18,
=1280+25,
=1305;
③
9 20÷
1 2×(
2 5+
4 5),
=
÷
1 2×
6 5,
=
×
6 5,
=
;
④
3 4×
3 4+
1 4×0.75-75%,
=
×0.75+
1 4×0.75-0.75,
=(
+
1 4-1)×0.75,
=0×0.75,
=0;
⑤3.6-2.8+3.4-7.2,
=(3.6+3.4)-(2.8+7.2),
=7-10,
=-3.