能简便运算的就用简便运算.

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/29 03:51:38
能简便运算的就用简便运算.

能简便运算的就用简便运算.
能简便运算的就用简便运算.
 

能简便运算的就用简便运算.
﹙1﹚9999×2222+3333×3334
=3333×﹙3×2222﹚+3333×3334
=3333×6666+3333×3334
=3333×﹙6666+3334﹚
=3333×10000
=33330000
﹙2﹚2356÷2356又2356/2357
=2356÷﹙2356×2357+2356﹚/2357
=2356×2357/﹙2356×2357+2356﹚
=2356×2357/[2356×﹙2357+1﹚]
=2357/2358,等于2358分之2357
﹙3﹚﹙28×7/4+12×1.75﹚÷21/8
=﹙49+21﹚×8/21
=49×8/21+21×8/21
=18又2/3+8
=26又2/3,等于26又3分之2
﹙4﹚4/5×2/3+1/3÷5/4
=4/5×2/3+1/3×4/5
=4/5×﹙2/3+1/3﹚
=4/5×1
=4/5,等于5分之4
﹙5﹚13÷19+18×13/19
=13×1/19+18×13/19
=13/19×﹙1+18﹚
=13/19×19
=13
﹙6﹚0.125×3/4+1/8×8.25+1.25
=0.125×﹙3/4+8.25+1﹚
=0.125×10
=1.25