
简便计算.578+298 13411-(223-1711)56×99 &n...
简便计算.578+29813411-(223-1711)56×993.7×8.8+0.22×37-370%...
简便计算.578+298 13411-(223-1711)56×99 3.7×8.8+0.22×37-370%
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①578+298
=578+300-2
=878-2
=876
②13
-(2
-1
)
=13
+1
-2
=15-2
=12
③56×99
=56×(100-1)
=56×100-56
=5600-56
=5544
④3.7×8.8+0.22×37-370%
=3.7×8.8+2.2×3.7-3.7
=3.7×(8.8+2.2-1)
=3.7×10
=37
=578+300-2
=878-2
=876
②13
4 |
11 |
2 |
3 |
7 |
11 |
=13
4 |
11 |
7 |
11 |
2 |
3 |
=15-2
2 |
3 |
=12
1 |
3 |
③56×99
=56×(100-1)
=56×100-56
=5600-56
=5544
④3.7×8.8+0.22×37-370%
=3.7×8.8+2.2×3.7-3.7
=3.7×(8.8+2.2-1)
=3.7×10
=37
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