3 运动定律与简便运算
用简便方法计算
2.6+6.92+3.4+0.08 ②3200÷4÷5 ③8.8﹣4.3﹣3.7
④312×4+188×4 ⑤32×125×25 ⑥2.43﹣(0.28+1.43)
脱式计算,能简算的要简算.
①96+320÷16﹣38 ②730﹣(450+300)÷25 ③(334﹣209)×8÷25
④213×42+213×58 ⑤2.04﹣0.36﹣1.64 ⑥8.29+3.7+0.71+6.3.
怎样简便就怎样计算.
49×102﹣2×49 87×4+885÷59
15.6﹣2.9+46.7 99×76
462﹣4004÷52+23 25×64×125
580﹣(20×25﹣500) 40.37﹣(14.95+10.37)
算一算
﹣
=
+
= 1﹣
=
+
+
=
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=
340+602= 280+420= 427﹣327= 500﹣306= 482﹣62=
50×3= 25×4= 125×8= 206×5= 400×8=
计算,能简算的要简算.
6.3+0.84+8.16 312×4﹣188×4 13.7×0.25×4
0.8×[13﹣(3.12+5.28)] 8.6×(3.6﹣1.2×3) 0.45×0.25.
计算下面各题,能用简便方法计算的要用简便方法计算.
①2.2×3.83+
②2.5×2.4+1.84+5.16
③7.8÷[32×(1﹣
)+3.6]
④
⑤3.8﹣(2.8+0.57)
⑥
.
计算下面各题,能用简便方法计算:
1.29+3.7+0.71+6.3 528×78+472×78
99×45+45 456﹣189﹣11
19×96﹣962÷74 (520+480)÷50×4
400﹣(1300÷65+35) 86.7﹣(14.3﹣3.8 )
用递等式计算.
①400﹣(1300÷65+35)
②(117+51)×(84÷7)
③27.89﹣(7.89+2.7)
④(125+70)×8
⑤23×134﹣23×34.
+0.6 31.9×18﹣8×31.9.
+8.3﹣
②
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