1樓:手機使用者
①1÷[7
10×(1-4
7)],
=1÷[7
10×37],
=1÷310,
=313
;②3.8×99+3.8,
=3.8×(99+1),
=3.8×100,
=3800;
③2700×(506-499)÷900,
=2700×7÷900,
=2700÷900×7,
=3×7,
=21;
④910
÷[12
×(65
-310
)],=9
10÷[12×9
10],
=910
÷920,=9
10×209,
=2;⑤33.02-(148.4-90.85)÷2.5,=33.02-57.55÷2.5,
=33.02-23.02,
=10;
⑥813
÷7+17×5
13,=813×17
+17×513
,=(8
13+5
13)×17,
=17;
脫式計算.(能簡算的要簡算)①1÷0.25+0.25÷1-2.5×0.1②1+2+3+4+5+6+5+4+3+2+16666662③22×4+24×6+
2樓:度鍍
①1÷0.25+0.25÷1-2.5×0.1,=4+0.25-0.25,
=4+(0.25-0.25),
=4+0,
=4;②1+2+3+4+5+6+5+4+3+2+16666662
,=36
6666662
,=18×2
3333331×2
,=18
3333331;③2
2×4+2
4×6+2
6×8+2
8×10
+210×12,=1
2-14+1
4-16+1
6-18+1
8-110+1
10-112,
=12-112,=5
12;④1÷(1-0.99)-99÷(1-0.999),=1÷0.01-99÷0.001,
=100-99000,
=-98900.
脫式計算,能簡算的要簡算,脫式計算(能簡算要簡算)?
1.3.8 3.91 復 22 19.7 3.8 3.91 2.3 3.8 1.7 5.5 68 0.5x 7.5 0.7 68 0.5x6.8 68 0.5 6.8 68 6.8 0.5 20352 162 36x24 352 4.5x24 352 108 244 六分之 制五 十四分之五 七分之...
計算。(能簡算的要簡算)脫式計算 能簡算的要簡算
1 3.6 8 17 17分之3乘3 3.6 8 17 9 17 3.6 17 17 3.6 1 2.6 2 3又11分之3 1又4分之3 3又11分之3 36 11 7 4 36 11 36 11 4 7 11 36 4 7 3 125 125 8 8 0 1 8 8 0 4 8又5分之4乘8又9...
脫式計算,能簡算的要簡算
du1 240 15 4,zhi 240 15 dao4 回 240 60,4 2 129 318 71,129 71 318,200 318,518 3 304 278,300 4 300 22 300 300 22 4 600 18,582 4 25 17 8 25 8 17,25 4 2 17...