9.8×25简便运算

9.8×25简便运算

9.8×25简便运算
=（10-0.2）x25
=10x25-0.2x25
=250+5
=255

10*2.5-0.2*2.5=25-0.5=24.5

9.8成25的简便运算

9.8×25=245
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9.8乘25 2.96乘40 简便运算

9.8x25
=（10-0.2）x25
=10x25-0.2x25
=250-5
=245
2.96x40
=（3-0.04）x40
=3x40-0.04x40
=120-1.6
=118.4

简便运算9.8×2.53

①9.8×2.5
=（10-0.2）×2.5
=10×2.5-0.2×2.5
=25-0.5
=24.5

②3.8×9.9+0.1×3.8
=3.8×（9.9+0.1）
=3.8×10
=38

③3.42×99+3.42
=3.42×（99+1）
=3.42×100
=342

8.5×9.8﹙简便运算﹚

8.5×9.8
=8.5×(10-0.2）
=85-1.7
=83.3

7.23×9.8简便运算

7.23*9.8=7.23*10-7.23*0.2=72.3-1.446=70.854
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9.4×9.8简便运算

9.4X9.8
=9.4X（10-0.2）
=9.4X10-9.4X0.2
=94-1.88
=92.12

4.5ⅹ9.8简便运算

4.5ⅹ9.8
=4.5×（10-0.2）
=45-0.9
=44.1

简便运算0.82×9.8

简便运算0.82×9.8
0.82×9.8
=0.82*(10-0.2)
=0.82*10-0.82*0.2
=8.036