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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