計算下面各題,能簡算的要簡算6 75 (

2021-03-17 02:03:35 字數 2378 閱讀 4076

1樓:燮璶殂抄嫪匪波

解(1)6.75-(4.2+1.75),

=6.75-1.75-4.2,

=0.8;

(2)3.5×(20.6-16.8÷4.8),=3.5×(20.6-3.5),

=3.5×17.1,

=59.85;

(3)[3 4

-(5 6

-2 3

)]÷5 4

,=[3 4

-1 6

]÷5 4

,=712

×4 5

,=715

;(4)48.38-21.63-8.37,=48.38-(8.37+21.63),

=48.38-30,

=18.38;

(5)(3 2

-2 3

+1 4

)×12,

=3 2

×12-2 3

×12+1 4

×12,

=18-8+3,

=13;

(6)3 4

÷[5 8

-(316

+1 4

)],=3 4

÷[5 8

-716

],=3 4

÷[10

16-7

16],

=3 4

÷316

,=3 4

×16 3

,=4.

計算下面各題,能簡算的要簡算. 1.29+3.7+0.71+6.3 7200÷25÷4 99×36+36 6.75-1.89-2.11 4000÷25

2樓:手機使用者

(1)1.29+3.7+0.71+6.3

=(1.29+0.71)+(3.7+6.3)=2+10

=12;

(2)7200÷25÷4

=7200÷(25×4)

=7200÷100

=72;

(3)99×36+36

=(99+1)×36

=100×36

=3600;

(4)6.75-1.89-2.11

=6.75-(1.89+2.11)

=6.75-4

=2.75;

(5)4000÷25-13×12

=160+156

=316;

(6)24×(133-1296÷12)

=24×(133-108)

=24×25

=600.

計算(寫出計算過程,能簡算的要簡算) 2-(6÷0.5-3×3)÷5+5×0.8 4 3 8 ×( 2

3樓:′小桃

(1)2-(6÷0.5-3×3)÷5+5×0.8,=2-(12-9)÷5+5×0.8,

=2-3÷5+5×0.8,

=2-0.6+4,

=1.4+4,

=5.4;

(2)43 8

×(2 5

+1 6

-3 7

)÷148

,=43 8

×(2 5

+1 6

-3 7

)×48,

=43 8

×48×(2 5

+1 6

-3 7

),=210×(2 5

+1 6

-3 7

),=210×2 5

+210×1 6

-210×3 7

,=84+35-90,

=119-90,

=29;

(3)1.25×3.45×6.789+3.75×1.15×1.211,

=4.3125×6.789+4.3125×1.211,=4.3125×(6.789+1.211),=4.3125×8,

=34.5;

(4)1

11×13

+113×15

+115×17

+117×19

,=1 2

×(111

-113

)+1 2

×(113

-115

)+1 2

×(115

-117

)+1 2

×(117

-119

),=1 2

×(111

-113

+113

-115

+115

-117

+117

-119

),=1 2

×(111

-119

),=1 2

×8209

,=4 209.

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