用递等式计算,能简算的要简算.1.25×32×2.5 &nb...
用递等式计算,能简算的要简算.1.25×32×2.586.5×2.4÷0.3-69018.75-6.2-3.83.7×7.3+7.3×6.3821×34+712×470....
用递等式计算,能简算的要简算.1.25×32×2.5 86.5×2.4÷0.3-690 18.75-6.2-3.8 3.7×7.3+7.3×6.3 821×34+712×47 0.4×7+25×3-0.4×3
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①1.25×32×2.5
=(1.25×8)×(2.5×4)
=10×10
=100;
②86.5×2.4÷0.3-690
=207.6÷0.3-690
=692-690
=2;
③18.75-6.2-3.8
=18.75-(6.2+3.8)
=18.75-10
=8.75;
④3.7×7.3+7.3×6.3
=7.3×(3.7+6.3)
=7.3×10
=73;
⑤
×
+
×
=
+
=
;
⑥0.4×7+
×3-0.4×3
=0.4×7+0.4×3-0.4×3
=0.4×(7+3-3)
=2.8.
=(1.25×8)×(2.5×4)
=10×10
=100;
②86.5×2.4÷0.3-690
=207.6÷0.3-690
=692-690
=2;
③18.75-6.2-3.8
=18.75-(6.2+3.8)
=18.75-10
=8.75;
④3.7×7.3+7.3×6.3
=7.3×(3.7+6.3)
=7.3×10
=73;
⑤
8 |
21 |
3 |
4 |
7 |
12 |
4 |
7 |
=
6 |
21 |
7 |
21 |
=
13 |
21 |
⑥0.4×7+
2 |
5 |
=0.4×7+0.4×3-0.4×3
=0.4×(7+3-3)
=2.8.
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