
脱式计算(能简便计算的要简便计算):80÷(1-84%) 1.3×35%+8.7×35%&nbs...
脱式计算(能简便计算的要简便计算):80÷(1-84%)1.3×35%+8.7×35%70+70×25%5-5×25+35[12-(34-35)]÷71079÷115+2...
脱式计算(能简便计算的要简便计算):80÷(1-84%) 1.3×35%+8.7×35% 70+70×25%5-5×25+35[12-(34-35)]÷710 79÷115+29×511
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①80÷(1-84%)
=80÷(1-0.84)
=80÷0.16
=500;
②1.3×35%+8.7×35%
=(1.3+8.7)×0.35
=10×0.35
=3.5;
③70+70×25%
=70+70×0.25
=70+17.5
=87.5;
④5-5×
+
=5-5×0.4+0.6
=5-2+0.6
=3+0.6
=3.6;
⑤[
-(
-
)]÷
=[
?
]÷
=
×
=
;
⑥
÷
+
×
=(
+
)×
=1×
=
.
=80÷(1-0.84)
=80÷0.16
=500;
②1.3×35%+8.7×35%
=(1.3+8.7)×0.35
=10×0.35
=3.5;
③70+70×25%
=70+70×0.25
=70+17.5
=87.5;
④5-5×
2 |
5 |
3 |
5 |
=5-5×0.4+0.6
=5-2+0.6
=3+0.6
=3.6;
⑤[
1 |
2 |
3 |
4 |
3 |
5 |
7 |
10 |
=[
1 |
2 |
3 |
20 |
7 |
10 |
=
7 |
20 |
10 |
7 |
=
1 |
2 |
⑥
7 |
9 |
11 |
5 |
2 |
9 |
5 |
11 |
=(
7 |
9 |
2 |
9 |
5 |
11 |
=1×
5 |
11 |
=
5 |
11 |
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