神机妙算细又巧!①711×89+711÷910②1375+450÷18×25③4×0.8×2.5×12.5④7.8-2.3-2.7⑤(79+421-37)×6.3⑥0.9×(99+0.9)-数学

题目简介

神机妙算细又巧!①711×89+711÷910②1375+450÷18×25③4×0.8×2.5×12.5④7.8-2.3-2.7⑤(79+421-37)×6.3⑥0.9×(99+0.9)-数学

题目详情

神机妙算细又巧!
7
11
×
8
9
+
7
11
÷
9
10
 ②1375+450÷18×25
③4×0.8×2.5×12.5④7.8-2.3-2.7
⑤(
7
9
+
4
21
-
3
7
)×6.3⑥0.9×(99+0.9)
题型:解答题难度:中档来源:不详

答案

class="stub"7
11
×class="stub"8
9
+class="stub"7
11
÷class="stub"9
10

=class="stub"7
11
×class="stub"8
9
+class="stub"7
11
×class="stub"10
9

=class="stub"7
11
×(class="stub"8
9
+class="stub"10
9
),
=class="stub"7
11
×2,
=class="stub"14
11


②1375+450÷18×25,
=1375+625,
=2000;

③4×0.8×2.5×12.5,
=4×2.5×(12.5×0.8),
=10×10,
=100;

④7.8-2.3-2.7,
=7.8-(2.3+2.7),
=7.8-5,
=2.8;

⑤(class="stub"7
9
+class="stub"4
21
-class="stub"3
7
)×6.3,
=class="stub"7
9
×6.3+class="stub"4
21
×6.3-class="stub"3
7
×6.3,
=4.9+1.2-2.7,
=3.4;

⑥0.9×(99+0.9),
=0.9×(100-1+0.9),
=0.9×(100-0.1),
=0.9×100-0.1×0.9,
=90-0.09,
=89.91.

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