计算下面各题,能简算的要简便算. (12.5×97)×0.8 16.8-1.36-8.64
计算下面各题,能简算的要简便算.(12.5×97)×0.816.8-1.36-8.6468÷[0.5×(7.5-7)](25-12×45)÷45137×135136+11...
计算下面各题,能简算的要简便算. (12.5×97)×0.8 16.8-1.36-8.64 68÷[0.5×(7.5-7)] (25-12×45)÷45 137×135136+1136×137 18×[12÷(35×109)].
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①州薯野(12.5×97)册喊×0.8
=12.5×0.8×97
=10×97
=970
②16.8-1.36-8.64
=16.8-(1.36+8.64)
=16.8-10
=6.8
③68÷[0.5×(7.5-7)]
=68÷[0.5×0.5]
=68÷0.25
=272
④(
-
×
)÷
=(
-
)×
=0×
=0
⑤137×
+
×137
=137×(
+
)
=137×1
=137
⑥
×[
÷(手数
×
)]
=
×[
×
]
=
×
=
=12.5×0.8×97
=10×97
=970
②16.8-1.36-8.64
=16.8-(1.36+8.64)
=16.8-10
=6.8
③68÷[0.5×(7.5-7)]
=68÷[0.5×0.5]
=68÷0.25
=272
④(
2 |
5 |
1 |
2 |
4 |
5 |
4 |
5 |
=(
2 |
5 |
2 |
5 |
5 |
4 |
=0×
5 |
4 |
=0
⑤137×
135 |
136 |
1 |
136 |
=137×(
135 |
136 |
1 |
136 |
=137×1
=137
⑥
1 |
8 |
1 |
2 |
3 |
5 |
10 |
9 |
=
1 |
8 |
1 |
2 |
3 |
2 |
=
1 |
8 |
3 |
4 |
=
3 |
32 |
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