脱式计算,(能用简便方法计算的要用简便方法计算)(1)10.1×87 (...

脱式计算,(能用简便方法计算的要用简便方法计算)(1)10.1×87 (2)2.3+2.99÷(22-19.7)(3)2.65×1.7+1.35×1.7 (4)6.3+0.84+3.7+8.16(5)18-(1.4+1.25×2.4)(6)1.25×7.2.

(1)10.1×87
=(10+0.1)×87
=10×87+0.1×87   
=870+8.7
=878.7;
       
(2)2.3+2.99÷(22-19.7)
=2.3+2.99÷2.3
=2.3+1.3
=4.6;

(3)2.65×1.7+1.35×1.7  
=(2.65+1.35)×1.7
=4×1.7
=6.8;

(4)6.3+0.84+3.7+8.16
=(6.3+3.7)+(8.16+0.84)
=10+9
=19;

(5)18-(1.4+1.25×2.4)
=18-(1.4+1.25×8×0.3)
=18-(1.4+10×0.3)
=18-(1.4+3)
=18-4.4
=136;

(6)1.25×7.2
=1.25×8×0.9
=10×0.9
=9.
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