1樓:手機使用者
(1)zhi2.86×0.25+2.86×0.48=0.715+1.3728
=2.0878;
(dao2)9.5÷
內[(1-0.5)÷0.1]
=9.5÷[0.95÷0.1]
=9.5÷9.5
=1;(3)0.77÷35=0.022;
(4)4×12-3x=42
4×12-3x+3x=42+3x
48=42+3x
3x=48-32
3x=6
x=2.容
脫式計算.(能簡算的要簡算) 0.125×0.25×8×4 [5-1.7÷(2-1)]×1 87×386 49÷(79+49)×114
2樓:手機使用者
(1)0.125×
源0.25×8×4,
=(0.125×8)×(0.25×4),
=1×1,
=1;(2)[5-1.7÷(2-1)]×1,=[5-1.7÷1]×1,
=[5-1.7]×1,
=3.3×1,
=3.3;
(3)87×386,
=(86+1)×386,
=86×3
86+1×386,
=3+386,
=3386
;(4)4
9÷(79+4
9)×114,
=49÷119
×114,=4
11×114,
=1;(5)3.9÷1.5-2.3×0.5,=2.6-1.15,
=1.45;
(6)112÷3
4-58×1635,
=2-27,
=157.
脫式計算(能簡算的要簡算
3樓:軒胤
(1)6.72-2.3÷0.5×0.8
=6.72-4.6×0.8
=6.72-3.68
=3.04;
(2)98-1
7+18-6
7=(98+1
8)-(17+6
7)=54
-1=14;
(3)9
10÷[1
2×(65-3
10)]
=910
÷[12
×910]=9
10÷9
20=2;
(4)(27+1
5)×7×5=27
×7×5+1
5×7×5
=10+7
=17.
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