脫式計算能簡便算的要簡算,寫出主要步驟

2021-03-04 06:47:01 字數 1276 閱讀 3510

1樓:姿態

①3.6-2.8+7.4-7.2

=3.6+7.4-(2.8+7.2)

=11-10

=1;②8

17÷23+1

23 ×

9 17

+123 =8

17×1

23+1

23×9

17+1

23×1

=(8 17

+917

+1)×1

23=2×1

23 =2

23;③(1 2

+1 3

)÷3 5

-1718 =5

6÷3 5

-1718

=2518

-1718 =4

9;④18÷[5 6

+(5 8

-1 3

)]=18÷(5 6

+724

)=18÷27

24=16.

用遞等式計算,能簡算的要寫出簡算過程. (2.5×6+2.5×4)÷5 35.6-2.8+4.4-7.2 0.25×3.2×12.

2樓:最強黑客

(1)(2.5×6+2.5×4)÷5,

=2.5×(6+4)÷5,

=2.5×10÷5,

=25÷5,

=5;(2)35.6-2.8+4.4-7.2,=(35.6+4.4)-(2.8+7.2),=40-10,

=30;

(3)0.25×3.2×12.5,

=0.25×4×0.8×12.5,

=(0.25×4)×(0.8×12.5),=1×10,

=10;

(4)7.5÷(1.5+2.5),

=7.5÷4,

=1.875;

(5)0.6×(5+0.6)-1,

=0.6×5+0.6×0.6-1,

=3+0.36-1,

=3.36-1,

=2.36;

(6)3.7×1.25-3.7×0.25,=3.7×(1.25-0.25),

=3.7×1,

=3.7.

2.8-5又4/9+7.2-3又5/9 脫式計算 能簡算就簡算

3樓:新野旁觀者

脫式計算 能簡算就簡算

2.8-5又4/9+7.2-3又5/9

=(2.8+7.2)-(5又4/9+3又5/9 )=10-9=1

脫式計算能簡算的要簡算

zhi1 5.4 86.5 16.25 0.5 dao 5.4 86.5 32.5 5.4 54,291.6 專 2 3 3 2 1021 2 7 3 5 7 2 7 3 5 7 2 7 3 1,2 3 95.6 18 4.4 18,95.6 4.4 屬18,100 18,1800 4 15 16 ...

7脫式計算,能簡算的要簡算,575957脫式計算,能簡算的要簡算

5 7 5 9 5 7 5 7x 1 5 9 5 7x4 9 20 63 希望能幫到你!1 8x9 7 5 7 8能簡算的要簡算 1 8x9 7 5 7 8可以先將裡面的5 7 8化成5 7 1 81 8x9 7 5 7 1 8 1 8 9 7 5 7 1 8 16 7 2 7 1 8x9 7 5 ...

請脫式計算,能簡算的要簡算4 85 3 62 1 38 5 1516 7 (6 2 9 58 33 25 0 25

1 4.85 3.62 1.38 5.15,du zhi4.85 5.15 3.62 1.38 dao專 10 5,15 2 16.7 6.2 9.5 8.3,16.7 15.7 8.3,1 8.3,8.3 3 3.25 屬0.25 1.75 0.25,13 7,20 4 10.52 3.52 1....