计算下面各题.(1)递等式计算:36÷〔(56-13)×3〕(2)解方程:17.5-5(x+0.5)=9x (3)简便计算:
计算下面各题.(1)递等式计算:36÷〔(56-13)×3〕(2)解方程:17.5-5(x+0.5)=9x(3)简便计算:(87.2+87.2+87.2×2)×25765...
计算下面各题.(1)递等式计算:36÷〔(56-13)×3〕(2)解方程:17.5-5(x+0.5)=9x (3)简便计算: (87.2+87.2+87.2×2)×25 765×213÷27+765×327÷27.
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(1)36÷〔(
-
)×3〕,
=36÷〔
×3〕,
=36÷
,
=24;
(2)17.5-5(x+0.5)=9x,
17.5-5x-2.5=9x,
15-5x=9x,
15-5x+5x=9x+5x,
14x=15,
渗橘塌森 丛衫团 14x÷14=15÷14,
x=
;
(3)(87.2+87.2+87.2×2)×25,
=87.2×(1+1+2)×25,
=87.2×4×25,
=87.2×(4×25),
=87.2×100,
=8720;
765×213÷27+765×327÷27,
=765×(213÷27+327÷27),
=765×[(213+327)÷27],
=765×[540÷27],
=765×20,
=15300.
5 |
6 |
1 |
3 |
=36÷〔
1 |
2 |
=36÷
3 |
2 |
=24;
(2)17.5-5(x+0.5)=9x,
17.5-5x-2.5=9x,
15-5x=9x,
15-5x+5x=9x+5x,
14x=15,
渗橘塌森 丛衫团 14x÷14=15÷14,
x=
15 |
14 |
(3)(87.2+87.2+87.2×2)×25,
=87.2×(1+1+2)×25,
=87.2×4×25,
=87.2×(4×25),
=87.2×100,
=8720;
765×213÷27+765×327÷27,
=765×(213÷27+327÷27),
=765×[(213+327)÷27],
=765×[540÷27],
=765×20,
=15300.
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