脱式计算.56×6.8+2.4×1.56+9.2×0.44 ...
脱式计算.56×6.8+2.4×1.56+9.2×0.44151112+161112+171112+131199+2199+…+197199+198199....
脱式计算.56×6.8+2.4×1.56+9.2×0.44 151112+161112+171112+131199+2199+…+197199+198199.
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(1)56×6.8+2.4×1.56+9.2×0.44,
=380.8+3.744+4.048,
=384.544+4.048,
=388.592;
(2)15
+16
+17
+
,
=(15+16+17)+
×3+
,
=48+
+
,
=50
+
,
=51
;
(3)
+
+…+
+
,
=
,
=
,
=
,
=99.
=380.8+3.744+4.048,
=384.544+4.048,
=388.592;
(2)15
11 |
12 |
11 |
12 |
11 |
12 |
1 |
3 |
=(15+16+17)+
11 |
12 |
1 |
3 |
=48+
11 |
4 |
1 |
3 |
=50
3 |
4 |
1 |
3 |
=51
1 |
12 |
(3)
1 |
199 |
2 |
199 |
197 |
199 |
198 |
199 |
=
1+2+…+197+198 |
199 |
=
(1+198)+(2+197)+…+(99+100) |
199 |
=
99×199 |
199 |
=99.
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