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| (1)2400÷80+14×12, =30+168, =198; (2)420÷[(205-198)×4], =420÷[7×4], =420÷7÷4, =60÷4, =15; (3)63×73-63×63, =63×(73-63), =63×10, =630; (4)25×44, =25×4×11, =100×11, =1100; (5)57×19+57, =57×(19+1), =57×20, =1140; (6)85×(100+1), =85×100+85×1, =8500+85, =8585. |
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